1. Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, University of Utrecht, Utrecht, The Netherlands
2. Netherlands Proteomics Center, Utrecht, The Netherlands
3. Pharma Technical Development, Roche Diagnostics GmbH, Penzberg, Germany
4. Pharma Technical Development, F. Hoffmann-La Roche AG, Basel, Switzerland