1. Department of Anatomy and Cell Biology, Justus Liebig University, Aulweg 123, Gießen 35392, Germany
2. Siemens Healthcare Diagnostic Products GmbH, Emil-von-Behring-Straße 76, 35041 Marburg, Germany
3. Max Planck Institute for Biophysical Chemistry, Bioanalytical Mass Spectrometry Group, Am Fassberg 11, 37077 Göttingen, Germany
4. Institute for Clinical Chemistry, Bioanalytics, University Medical Center Göttingen, Robert Koch Straße 40, 37075 Göttingen, Germany
5. Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, U.S.A
6. Institute of Experimental and Clinical Pharmacology and Toxicology, University of Freiburg, Medical Faculty, Albertstraße 25, 79104 Freiburg, Germany