Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Mass Spectrometry Laboratory, Marktstrasse 29, Ruesselsheim am Main, D-65428, Germany.
Department of Chemistry, Universität Konstanz, Konstanz, 78457, Germany.
Department of Chemistry, A.I. Cuza University of Iasi, Iasi, Romania.