1. Max-Planck Institute for Molecular Biomedicine, Mouse Embryology Laboratory, Röntgenstrasse 20, D-48149 Münster, Germany
2. DZNE, German Center for Neurodegenerative Disorders, Gehlsheimer Strasse 20, D-18147 Rostock, Germany
3. Institute for Biostatistics and Informatics in Medicine and Ageing Research, University of Rostock, Ernst Heydemann-Strasse 8, D-18057 Rostock, Germany
4. Arrows Biomedical GmbH, Gievenbecker Weg 11, D-48149 Münster, Germany
5. Institute of Biochemistry II, Goethe University Medical School, Theodor-Stern-Kai Strasse 7, D-60590 Frankfurt am Main, Germany
6. Max-Planck Institute for Molecular Biomedicine, Bioanalytical Mass Spectrometry Facility, Röntgenstrasse 20, D-48149 Münster, Germany