Vaccine Evaluation Center (Bettinger, Greyson), Department of Pediatrics, BC Children's Hospital, University of British Columbia, Vancouver, BC; Department of Communication (Greyson), University of Massachusetts, Amherst, Mass.; School of Public Policy, Department of Sociology and Center for Healthy Communities (Carpiano), University of California, Riverside, Riverside, Calif.; Interior Health Authority BC (de Bruin, Aguiar), Kelowna, BC; Communicable Diseases and Immunization Service (Naus), BC Centre for Disease Control; School of Population and Public Health (Naus), University of British Columbia, Vancouver, BC; Vancouver Island Health Authority (Hodson), Comox, BC; BC Patient Safety and Quality Council (Hodson), Vancouver, BC.