1. Department of Anaesthesia
and Intensive Care, University Medical Center Rostock, Schillingallee 35, 18057 Rostock, Germany
2. Ionicon Analytik GmbH, Eduard-Bodem-Gasse 3, A-6020 Innsbruck, Austria
3. Joint Mass Spectrometry
Centre, Chair of Analytical Chemistry, University of Rostock, Dr. Lorenz Weg
1, 18059 Rostock, Germany and Joint Mass Spectrometry Centre, Cooperation Group “Comprehensive
Molecular Analytics”, Helmholtz Zentrum München, D-85764 Neuherberg, Germany