1. Center for Metabolomics and Mass Spectrometry, The Scripps Research Institute, La Jolla, CA 92122, USA.
2. Department II of Internal Medicine and Center for Molecular Medicine, University of Cologne, Cologne 50931, Germany.
3. Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
4. COMBINE-Joint Research Center for Computational Biomedicine RWTH Aachen University, Aachen 52074, Germany.
5. Institute of Computational Biomedicine, Bioquant, Faculty of Medicine and Heidelberg University Hospital, Heidelberg University, Heidelberg 69120, Germany.
6. Faculty of Biosciences, University of Heidelberg, Heidelberg 69120, Germany.
7. Molecular Medicine Partnership Unit (MMPU), European Molecular Biology Laboratory and Heidelberg University, Heidelberg 69120, Germany.
8. Clement J. Zablocki VA Medical Center, Milwaukee, WI 53295, USA.