Bertrand Rochat1, Julia Bilat2, Baptiste Grund2. 1. Quantitative Mass Spectrometry Facility, University of Lausanne, Centre Hospitalier Universitaire Vaudois, Rte du Bugnon 46, CH-1011 Lausanne, Switzerland. bertrand.rochat@chuv.ch. 2. Quantitative Mass Spectrometry Facility, University of Lausanne, Centre Hospitalier Universitaire Vaudois, Rte du Bugnon 46, CH-1011 Lausanne, Switzerland.