1. Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, University of Utrecht, Padualaan 8, Utrecht 3584 CH, The Netherlands
2. Netherlands Proteomics Center, Padualaan 8, Utrecht 3584 CH, The Netherlands
3. Pharma Technical Development, Roche Diagnostics GmbH, Penzberg 82377, Germany