1. Center for Proteomics and Metabolomics, Leiden University Medical Center, Albinusdreef 2, Leiden 2333ZA, The Netherlands
2. Genome BC Proteomics Centre, University of Victoria, Victoria, British Columbia V8Z 7X8, Canada
3. Institute of Experimental Genetics, German Research Center for Environmental Health, Helmholtz Zentrum München, Ingolstaedter Landstr. 1, Neuherberg 85764, Germany
4. Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, 8 Medical Drive, Singapore 117597, Singapore
5. Institute of Biochemistry, Faculty of Medicine, University of Ljubljana, Vrazov Trg 2, Ljubljana 1000, Slovenia
6. Northwest Metabolomics Research Center, Department of Anesthesiology, University of Washington, Seattle, Washington 98109, United States
7. Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, 1333 Center Drive, Gainesville, Florida 32610, United States
8. Department of Genetics, School of Medicine, Stanford University, 300 Pasteur Drive, Stanford, California 94305, United States
9. Metabolomics Unit, Institute for Molecular Medicine Finland (FIMM), HiLIFE, University of Helsinki, Tukholmankatu 8, Biomedicum 2U, Helsinki 00014, Finland
10. Metabolomics and Proteomics Core, German Research Center for Environmental Health, Helmholtz Zentrum München, Ingolstaedter Landstr. 1, Neuherberg 85764, Germany
11. SCIEX, 1201 Radio Rd, Redwood City, California 94065, USA
12. Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
13. Department of Clinical Chemistry, University Medical Center, Erasmus MC, Rotterdam, 3000CA, The Netherlands
14. National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224, United States
15. SCIEX, Framingham, Massachusetts 01701, United States
16. SCIEX, Macclesfield SK10 4TG, United Kingdom
17. Department of Internal Medicine, University Medical Center, Erasmus MC, Rotterdam 3000CA, The Netherlands
18. Department of Biological Chemistry, University of California, Los Angeles, California 90095, United States