1. Institute of Hygiene, University of Münster, Robert-Koch-Str. 41, 48149 Münster, Germany
2. Interdisciplinary Center for Clinical Research (IZKF), University of Münster, Domagkstr. 3, 48149 Münster, Germany
3. Center for Proteomics and Metabolomics, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
4. Bruker Daltonik GmbH, Fahrenheitstr. 4, 28359 Bremen, Germany