1. Biomolecular Mass Spectrometry and Proteomics, Padualaan 8, 3584 CH Utrecht, The Netherlands
2. Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
3. Mass Spectrometry and Proteomics Facility, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands