1. Department of Chemistry, Nucleoside Research and Mass Spectrometry Unit and Center for Proteomics and Mass Spectrometry, University of Antwerp, Groenenborgelaan 171, B-2020, Antwerp, Belgium
2. Department of Chemistry, Cryospectroscopy, University of Antwerp, Antwerp, Belgium
3. Biochemistry Group, School of Biological Sciences and Biomolecular Analysis Mass Spectrometry Facility, University of Wales, Swansea, UK
4. Department of Biology, Laboratory for Plant Biochemistry and Center for Mass Spectrometry and Proteomics, University of Antwerp, Antwerp, Belgium