1. Institute of Cardiovascular Research and Sport Medicine - Department of Molecular and Cellular Sport Medicine; German Sport University Cologne; Germany
2. Institute of Biochemistry - Center for Preventive Doping Research; German Sport University Cologne; Am Sportpark Müngersdorf 6; 50933; Cologne; Germany
3. Olympic Analytical Laboratory, Department of Pathology and Laboratory Medicine; University of California Los Angeles; CA; 90025-6106; USA
4. RIKILT Wageningen UR- Institute for Food Safety; Wageningen; the Netherlands