R Manber

Affiliations

Department of Psychiatry and Behavioral Sciences, School of Medicine, Stanford University, Stanford, California, USA.

Publications (41)

The role of economic analyses in promoting adoption of behavioral and psychosocial interventions in clinical settings.

Health psychology : official journal of the Division of Health Psychology, American Psychological Association

Avec: Paul B Jacobsen , Ravi Prasad , Jennifer Villani , Chuan-Mei Lee , Danielle Rochlin , Claudia Scheuter , Robert M Kaplan , Kenneth E Freedland , Rachel Manber , Jubran Kanaan , Dawn K Wilson

Objective and subjective sleep health in adolescence: Associations with puberty and affect.

Journal of sleep research

Avec: Jaclyn S Kirshenbaum , Saché M Coury , Natalie L Colich , Rachel Manber , Ian H Gotlib

Daytime napping and nighttime sleep in pregnant individuals with insomnia disorder.

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine

Avec: Sylvia E Badon , Jessica R Dietch , Norah Simpson , Deirdre J Lyell , Rachel Manber

Sleep and affect: A conceptual review.

Sleep medicine reviews

Avec: Maia Ten Brink , Jessica R Dietch , Joshua Tutek , Sooyeon A Suh , James J Gross , Rachel Manber

Randomized controlled trial of cognitive behavioral therapy for perinatal insomnia: postpartum outcomes.

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine

Avec: Rachel Manber , Bei Bei , Sooyeon Suh , Norah Simpson , Elizabeth Rangel , Anita Sit , Deirdre J Lyell

Patient Engagement and Provider Effectiveness of a Novel Sleep Telehealth Platform and Remote Monitoring Assessment in the US Military: Pilot Study Providing Evidence-Based Sleep Treatment Recommendations.

JMIR formative research

Avec: Emerson M Wickwire , Jacob Collen , Vincent F Capaldi , Scott G Williams , Samson Z Assefa , Julianna P Adornetti , Kathleen Huang , Janet M Venezia , Rachell L Jones , Christine W Johnston , Connie Thomas , Mary Ann Thomas , Charles Mounts , Christopher L Drake , Michael S Businelle , Michael A Grandner , Rachel Manber , Jennifer S Albrecht

Improving perinatal sleep via a scalable cognitive behavioural intervention: findings from a randomised controlled trial from pregnancy to 2 years postpartum.

Psychological medicine

Avec: Bei Bei , Donna M Pinnington , Nina Quin , Lin Shen , Michelle Blumfield , Joshua F Wiley , Sean P A Drummond , Louise K Newman , Rachel Manber

RCT of the effectiveness of stepped-care sleep therapy in general practice: The RESTING study protocol.

Contemporary clinical trials

Avec: Rachel Manber , Isabelle A Tully , Latha Palaniappan , Jane P Kim , Norah Simpson , Donna M Zulman , Jeremy D Goldhaber-Fiebert , Elizabeth Rangel , Jessica R Dietch , Lisa G Rosas

Stepped care management of insomnia co-occurring with sleep apnea: the AIR study protocol.

Trials

Avec: E Devon Eldridge-Smith , Rachel Manber , Sheila Tsai , Clete Kushida , Bryan Simmons , Rachel Johnson , Roxane Horberg , Ann Depew , Aysha Abraibesh , Norah Simpson , Matthew Strand , Colin A Espie , Jack D Edinger

Sleep-wake timing and chronotype in perinatal periods: longitudinal changes and associations with insomnia symptoms, sleep-related impairment, and mood from pregnancy to 2 years postpartum.

Journal of sleep research

Avec: Sumedha Verma , Donna M Pinnington , Rachel Manber , Bei Bei

Perspectives on increasing the impact and reach of CBT-I.

Sleep

Avec: Rachel Manber , Norah Simpson , Nicole B Gumport

Feasibility and Acceptability of Mindfulness-based Stress Reduction and Prenatal Sleep Classes for Poor Prenatal Sleep Quality: Pilot Randomized Controlled Trial.

Behavioral sleep medicine

Avec: J N Felder , R Mirchandaney , R Manber , J Cuneo , A Krystal , N Solomon , S Janette , L Zhang , P Moran , M Mashash , E Epel , F M Hecht

Amyloid-PET imaging predicts functional decline in clinically normal individuals.

Alzheimer's research & therapy

Avec: Lisa Quenon , Lyduine E Collij , David Vállez Garcia , Isadora Lopes Alves , Thomas Gérard , Vincent Malotaux , Lara Huyghe , Juan Domingo Gispert , Frank Jessen , Pieter Jelle Visser , Anouk den Braber , Craig W Ritchie , Mercè Boada , Marta Marquié , Rik Vandenberghe , Emma S Luckett , Michael Schöll , Giovanni B Frisoni , Christopher Buckley , Andrew Stephens , Daniele Altomare , Lisa Ford , Cindy Birck , Anja Mett , Rossella Gismondi , Robin Wolz , Sylke Grootoonk , Richard Manber , Mahnaz Shekari , Renaud Lhommel , Laurence Dricot , Adrian Ivanoiu , Gill Farrar , Frederik Barkhof , Bernard J Hanseeuw , Auteur inconnu

Effects of a Triage Checklist to Optimize Insomnia Treatment Outcomes and Reduce Hypnotic Use: The RESTING Study.

Sleep

Avec: Rachel Manber , Nicole B Gumport , Isabelle A Tully , Jane P Kim , Bohye Kim , Norah Simpson , Lisa G Rosas , Donna M Zulman , Jeremy D Goldhaber-Fiebert , Elizabeth Rangel , Jessica R Dietch , Joshua Tutek , Latha Palaniappan

Patient perceptions of digital and therapist-led CBT for insomnia: A qualitative study.

Behavioral sleep medicine

Avec: Nicole B Gumport , Isabelle A Tully , Joshua Tutek , Jessica R Dietch , Donna M Zulman , Lisa G Rosas , Norah Simpson , Rachel Manber

Mothers' postpartum sleep disturbance is associated with the ability to sustain sensitivity toward infants.

Sleep medicine

Avec: Lucy S King , Elizabeth Rangel , Norah Simpson , Liat Tikotzky , Rachel Manber

A scalable cognitive behavioural program to promote healthy sleep during pregnancy and postpartum periods: protocol of a randomised controlled trial (the SEED project).

BMC pregnancy and childbirth

Avec: Bei Bei , Donna M Pinnington , Lin Shen , Michelle Blumfield , Sean P A Drummond , Louise K Newman , Rachel Manber

Circadian Preference as a Moderator of Depression Outcome Following Cognitive Behavioral Therapy for Insomnia Plus Antidepressant Medications: A Report From the TRIAD Study.

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine

Avec: Lauren D Asarnow , Bei Bei , Andrew Krystal , Daniel J Buysse , Michael E Thase , Jack D Edinger , Rachel Manber

Viability of an Early Sleep Intervention to Mitigate Poor Sleep and Improve Well-being in the COVID-19 Pandemic: Protocol for a Feasibility Randomized Controlled Trial.

JMIR research protocols

Avec: Kathleen Patricia O'Hora , Raquel A Osorno , Dena Sadeghi-Bahmani , Mateo Lopez , Allison Morehouse , Jane P Kim , Rachel Manber , Andrea N Goldstein-Piekarski

Stress, Sleep, and Coping Self-Efficacy in Adolescents.

Journal of youth and adolescence

Avec: Maia Ten Brink , Hae Yeon Lee , Rachel Manber , David S Yeager , James J Gross

Individual differences in perceived sleep quality do not predict negative affect reactivity or regulation.

Biological psychology

Avec: Jinxiao Zhang , Maia Ten Brink , Sylvia D Kreibig , Gadi Gilam , Philippe R Goldin , Rachel Manber , Sean Mackey , James J Gross

Pepinemab antibody blockade of SEMA4D in early Huntington's disease: a randomized, placebo-controlled, phase 2 trial.

Nature medicine

Avec: Andrew Feigin , Elizabeth E Evans , Terrence L Fisher , John E Leonard , Ernest S Smith , Alisha Reader , Vikas Mishra , Richard Manber , Kimberly A Walters , Lisa Kowarski , David Oakes , Eric Siemers , Karl D Kieburtz , Maurice Zauderer , Auteur inconnu

ACU193, a Monoclonal Antibody that Selectively Binds Soluble Aß Oligomers: Development Rationale, Phase 1 Trial Design, and Clinical Development Plan.

The journal of prevention of Alzheimer's disease

Avec: E Siemers , J Hitchcock , K Sundell , R Dean , J Jerecic , E Cline , K Iverson , J Moore , C Edgar , R Manber , N Fuin , T Poppe , R Barton

Beliefs about prescription sleep medications and interest in reducing hypnotic use: an examination of middle-aged and older adults with insomnia disorder.

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine

Avec: Isabelle A Tully , Jane P Kim , Norah Simpson , Latha Palaniappan , Joshua Tutek , Nicole B Gumport , Jessica R Dietch , Rachel Manber

Cognitive Behavioral Therapy for Insomnia in Depression.

Sleep medicine clinics

Avec: Lauren D Asarnow , Rachel Manber

Effect of Electroacupuncture vs Sham Treatment on Change in Pain Severity Among Adults With Chronic Low Back Pain: A Randomized Clinical Trial.

JAMA network open

Avec: Jiang-Ti Kong , Chelcie Puetz , Lu Tian , Isaac Haynes , Eunyoung Lee , Randall S Stafford , Rachel Manber , Sean Mackey

Active Duty Service Members, Primary Managers, and Administrators' Perspectives on a Novel Sleep Telehealth Management Platform in the U.S. Military Healthcare System.

Military medicine

Avec: Emerson M Wickwire , Moaz Abdelwadoud , Jacob Collen , Hillary Edwards , Christian Labra , Vincent F Capaldi , Scott G Williams , Rachel Manber , Samson Z Assefa , Christopher L Drake , Jennifer S Albrecht , Jeffrey Bevan , Alexandra Mahoney , Eileen D Tatum , Elysse Pierre , Janna Mantua , Michael A Grandner , C Daniel Mullins

Cognitive behavioural therapy for insomnia reduces actigraphy and diary measured sleep discrepancy for individuals with comorbid insomnia and major depressive disorder: A report from the TRIAD study.

Sleep medicine

Avec: Marie-Antoinette Spina , Bei Bei , Shanthakumar W Rajaratnam , Andrew Krystal , Jack D Edinger , Daniel J Buysse , Michael Thase , Rachel Manber

Daytime affect and sleep EEG activity: A data-driven exploration.

Journal of sleep research

Avec: Jin-Xiao Zhang , Maia Ten Brink , Yan Yan , Andrea Goldstein-Piekarski , Adam J Krause , Rachel Manber , Sylvia Kreibig , James J Gross

Increased high-frequency NREM EEG power associated with mindfulness-based interventions for chronic insomnia: Preliminary findings from spectral analysis.

Journal of psychosomatic research

Avec: Michael R Goldstein , Arlener D Turner , Spencer C Dawson , Zindel V Segal , Shauna L Shapiro , James K Wyatt , Rachel Manber , David Sholtes , Jason C Ong

Cognitive Behavioral Therapy for Prenatal Insomnia: A Randomized Controlled Trial.

Obstetrics and gynecology

Avec: Rachel Manber , Bei Bei , Norah Simpson , Lauren Asarnow , Elizabeth Rangel , Anita Sit , Deirdre Lyell

Engaging Stakeholders to Optimize Sleep Disorders' Management in the U.S. Military: A Qualitative Analysis.

Military medicine

Avec: Moaz Abdelwadoud , Jacob Collen , Hillary Edwards , C Daniel Mullins , Sophia L Jobe , Christian Labra , Vincent F Capaldi , Samson Z Assefa , Scott G Williams , Christopher L Drake , Jennifer S Albrecht , Rachel Manber , Alexandra Mahoney , Jeffrey Bevan , Michael A Grandner , Emerson M Wickwire

Differentiating perinatal Insomnia Disorder and sleep disruption: a longitudinal study from pregnancy to 2 years postpartum.

Sleep

Avec: Nina Quin , Jin Joo Lee , Donna M Pinnington , Louise Newman , Rachel Manber , Bei Bei

Examining Experiences of Poor Sleep During Pregnancy: A Qualitative Study to Inform the Development of a Prenatal Sleep Intervention.

Global advances in health and medicine

Avec: Jennifer N Felder , Riya Mirchandaney , Jessica Harrison , Rachel Manber , Judith Cuneo , Andrew Krystal , Elissa Epel , Frederick Hecht

Impact of cerebral blood flow and amyloid load on SUVR bias.

EJNMMI research

Avec: Fiona Heeman , Maqsood Yaqub , Janine Hendriks , Bart N M van Berckel , Lyduine E Collij , Katherine R Gray , Richard Manber , Robin Wolz , Valentina Garibotto , Catriona Wimberley , Craig Ritchie , Frederik Barkhof , Juan Domingo Gispert , David Vállez García , Isadora Lopes Alves , Adriaan A Lammertsma , Auteur inconnu

Objective sleep duration and response to combined pharmacotherapy and cognitive behavioral insomnia therapy among patients with comorbid depression and insomnia: a report from the TRIAD study.

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine

Avec: Jack D Edinger , Elizabeth Devon Smith , Daniel J Buysse , Michael Thase , Andrew D Krystal , Stephen Wiskniewski , Rachel Manber

Mindfulness-Based Stress Reduction, Cognitive Behavioral Therapy, and Acupuncture in Chronic Low Back Pain: Protocol for Two Linked Randomized Controlled Trials.

JMIR research protocols

Avec: Sean Mackey , Gadi Gilam , Beth Darnall , Philippe Goldin , Jiang-Ti Kong , Christine Law , Marissa Heirich , Nicholas Karayannis , Ming-Chih Kao , Lu Tian , Rachel Manber , James Gross

Intensity of Chronic Low Back Pain and Activity Interference: A Daily Diary Study of the Moderating Role of Cognitive Pain Coping Strategies.

Pain medicine (Malden, Mass.)

Avec: Dana Vertsberger , Anat Talmon , Maisa Ziadni , Jiang-Ti Kong , Beth D Darnall , Rachel Manber , Sean Mackey , James J Gross

Integrating technology to increase the reach of CBT-I: state of the science and challenges ahead.

Sleep

Avec: Rachel Manber , Carmela Alcántara , Bei Bei , Charles M Morin , Annemieke A van Straten

Pre-sleep affect predicts subsequent REM frontal theta in nonlinear fashion.

Cognitive, affective & behavioral neuroscience

Avec: Maia Ten Brink , Yan Yan , Jinxiao Zhang , Andrea Goldstein-Piekarski , Adam Krause , Sylvia Kreibig , Rachel Manber , James Gross

The Role of Emotion Regulation, Affect, and Sleep in Individuals With Sleep Bruxism and Those Without: Protocol for a Remote Longitudinal Observational Study.

JMIR research protocols

Avec: Sylvia D Kreibig , Maia Ten Brink , Ashish Mehta , Anat Talmon , Jin-Xiao Zhang , Alan S Brown , Sawyer S Lucas-Griffin , Ariel K Axelrod , Rachel Manber , Gilles J Lavigne , James J Gross

Réseau de co-auteurs

Rachel Manber 36 collaborations

Norah Simpson 10 collaborations

Bei Bei 9 collaborations

Jessica R Dietch 6 collaborations

Maia Ten Brink 6 collaborations

James J Gross 6 collaborations

Elizabeth Rangel 5 collaborations

Joshua Tutek 4 collaborations

Donna M Pinnington 4 collaborations

Isabelle A Tully 4 collaborations

Jane P Kim 4 collaborations

Jack D Edinger 4 collaborations

Nicole B Gumport 4 collaborations

Sean Mackey 4 collaborations

Emerson M Wickwire 3 collaborations

Jacob Collen 3 collaborations

Vincent F Capaldi 3 collaborations

Scott G Williams 3 collaborations

Samson Z Assefa 3 collaborations

Christopher L Drake 3 collaborations

Michael A Grandner 3 collaborations

Jennifer S Albrecht 3 collaborations

Latha Palaniappan 3 collaborations

Donna M Zulman 3 collaborations

Lisa G Rosas 3 collaborations

Richard Manber 3 collaborations

None None 3 collaborations

Andrew Krystal 3 collaborations

Daniel J Buysse 3 collaborations

Jiang-Ti Kong 3 collaborations

Deirdre J Lyell 2 collaborations

Anita Sit 2 collaborations

Nina Quin 2 collaborations

Lin Shen 2 collaborations

Michelle Blumfield 2 collaborations

Sean P A Drummond 2 collaborations

Louise K Newman 2 collaborations

Jeremy D Goldhaber-Fiebert 2 collaborations

Lyduine E Collij 2 collaborations

Isadora Lopes Alves 2 collaborations

Juan Domingo Gispert 2 collaborations

Robin Wolz 2 collaborations

Frederik Barkhof 2 collaborations

Lauren D Asarnow 2 collaborations

Jinxiao Zhang 2 collaborations

Sylvia D Kreibig 2 collaborations

Gadi Gilam 2 collaborations

Lu Tian 2 collaborations

Moaz Abdelwadoud 2 collaborations

Hillary Edwards 2 collaborations

Christian Labra 2 collaborations

Jeffrey Bevan 2 collaborations

Alexandra Mahoney 2 collaborations

C Daniel Mullins 2 collaborations

Michael Thase 2 collaborations

Jin-Xiao Zhang 2 collaborations

Yan Yan 2 collaborations

Andrea Goldstein-Piekarski 2 collaborations

Sylvia Kreibig 2 collaborations

James Gross 2 collaborations

Anat Talmon 2 collaborations

Paul B Jacobsen 1 collaboration

Ravi Prasad 1 collaboration

Jennifer Villani 1 collaboration

Chuan-Mei Lee 1 collaboration

Danielle Rochlin 1 collaboration

Claudia Scheuter 1 collaboration

Robert M Kaplan 1 collaboration

Kenneth E Freedland 1 collaboration

Jubran Kanaan 1 collaboration

Dawn K Wilson 1 collaboration

Jaclyn S Kirshenbaum 1 collaboration

Saché M Coury 1 collaboration

Natalie L Colich 1 collaboration

Ian H Gotlib 1 collaboration

Sylvia E Badon 1 collaboration

Sooyeon A Suh 1 collaboration

Sooyeon Suh 1 collaboration

Julianna P Adornetti 1 collaboration

Kathleen Huang 1 collaboration

Janet M Venezia 1 collaboration

Rachell L Jones 1 collaboration

Christine W Johnston 1 collaboration

Connie Thomas 1 collaboration

Mary Ann Thomas 1 collaboration

Charles Mounts 1 collaboration

Michael S Businelle 1 collaboration

Joshua F Wiley 1 collaboration

E Devon Eldridge-Smith 1 collaboration

Sheila Tsai 1 collaboration

Clete Kushida 1 collaboration

Bryan Simmons 1 collaboration

Rachel Johnson 1 collaboration

Roxane Horberg 1 collaboration

Ann Depew 1 collaboration

Aysha Abraibesh 1 collaboration

Matthew Strand 1 collaboration

Colin A Espie 1 collaboration

Sumedha Verma 1 collaboration

J N Felder 1 collaboration

R Mirchandaney 1 collaboration

J Cuneo 1 collaboration

A Krystal 1 collaboration

N Solomon 1 collaboration

S Janette 1 collaboration

L Zhang 1 collaboration

P Moran 1 collaboration

M Mashash 1 collaboration

E Epel 1 collaboration

F M Hecht 1 collaboration

Lisa Quenon 1 collaboration

David Vállez Garcia 1 collaboration

Thomas Gérard 1 collaboration

Vincent Malotaux 1 collaboration

Lara Huyghe 1 collaboration

Frank Jessen 1 collaboration

Pieter Jelle Visser 1 collaboration

Anouk den Braber 1 collaboration

Craig W Ritchie 1 collaboration

Mercè Boada 1 collaboration

Marta Marquié 1 collaboration

Rik Vandenberghe 1 collaboration

Emma S Luckett 1 collaboration

Michael Schöll 1 collaboration

Giovanni B Frisoni 1 collaboration

Christopher Buckley 1 collaboration

Andrew Stephens 1 collaboration

Daniele Altomare 1 collaboration

Lisa Ford 1 collaboration

Cindy Birck 1 collaboration

Anja Mett 1 collaboration

Rossella Gismondi 1 collaboration

Sylke Grootoonk 1 collaboration

Mahnaz Shekari 1 collaboration

Renaud Lhommel 1 collaboration

Laurence Dricot 1 collaboration

Adrian Ivanoiu 1 collaboration

Gill Farrar 1 collaboration

Bernard J Hanseeuw 1 collaboration

Bohye Kim 1 collaboration

Lucy S King 1 collaboration

Liat Tikotzky 1 collaboration

Michael E Thase 1 collaboration

Kathleen Patricia O'Hora 1 collaboration

Raquel A Osorno 1 collaboration

Dena Sadeghi-Bahmani 1 collaboration

Mateo Lopez 1 collaboration

Allison Morehouse 1 collaboration

Andrea N Goldstein-Piekarski 1 collaboration

Hae Yeon Lee 1 collaboration

David S Yeager 1 collaboration

Philippe R Goldin 1 collaboration

Andrew Feigin 1 collaboration

Elizabeth E Evans 1 collaboration

Terrence L Fisher 1 collaboration

John E Leonard 1 collaboration

Ernest S Smith 1 collaboration

Alisha Reader 1 collaboration

Vikas Mishra 1 collaboration

Kimberly A Walters 1 collaboration

Lisa Kowarski 1 collaboration

David Oakes 1 collaboration

Eric Siemers 1 collaboration

Karl D Kieburtz 1 collaboration

Maurice Zauderer 1 collaboration

E Siemers 1 collaboration

J Hitchcock 1 collaboration

K Sundell 1 collaboration

R Dean 1 collaboration

J Jerecic 1 collaboration

E Cline 1 collaboration

K Iverson 1 collaboration

J Moore 1 collaboration

C Edgar 1 collaboration

N Fuin 1 collaboration

T Poppe 1 collaboration

R Barton 1 collaboration

Chelcie Puetz 1 collaboration

Isaac Haynes 1 collaboration

Eunyoung Lee 1 collaboration

Randall S Stafford 1 collaboration

Eileen D Tatum 1 collaboration

Elysse Pierre 1 collaboration

Janna Mantua 1 collaboration

Marie-Antoinette Spina 1 collaboration

Shanthakumar W Rajaratnam 1 collaboration

Adam J Krause 1 collaboration

Michael R Goldstein 1 collaboration

Arlener D Turner 1 collaboration

Spencer C Dawson 1 collaboration

Zindel V Segal 1 collaboration

Shauna L Shapiro 1 collaboration

James K Wyatt 1 collaboration

David Sholtes 1 collaboration

Jason C Ong 1 collaboration

Lauren Asarnow 1 collaboration

Deirdre Lyell 1 collaboration

Sophia L Jobe 1 collaboration

Jin Joo Lee 1 collaboration

Louise Newman 1 collaboration

Jennifer N Felder 1 collaboration

Riya Mirchandaney 1 collaboration

Jessica Harrison 1 collaboration

Judith Cuneo 1 collaboration

Elissa Epel 1 collaboration

Frederick Hecht 1 collaboration

Fiona Heeman 1 collaboration

Maqsood Yaqub 1 collaboration

Janine Hendriks 1 collaboration

Bart N M van Berckel 1 collaboration

Katherine R Gray 1 collaboration

Valentina Garibotto 1 collaboration

Catriona Wimberley 1 collaboration

Craig Ritchie 1 collaboration

David Vállez García 1 collaboration

Adriaan A Lammertsma 1 collaboration

Elizabeth Devon Smith 1 collaboration

Andrew D Krystal 1 collaboration

Stephen Wiskniewski 1 collaboration

Beth Darnall 1 collaboration

Philippe Goldin 1 collaboration

Christine Law 1 collaboration

Marissa Heirich 1 collaboration

Nicholas Karayannis 1 collaboration

Ming-Chih Kao 1 collaboration

Dana Vertsberger 1 collaboration

Maisa Ziadni 1 collaboration

Beth D Darnall 1 collaboration

Carmela Alcántara 1 collaboration

Charles M Morin 1 collaboration

Annemieke A van Straten 1 collaboration

Adam Krause 1 collaboration

Ashish Mehta 1 collaboration

Alan S Brown 1 collaboration

Sawyer S Lucas-Griffin 1 collaboration

Ariel K Axelrod 1 collaboration

Gilles J Lavigne 1 collaboration