West-German Center of Diabetes and Health, Düsseldorf Catholic Hospital Group, 40591 Düsseldorf, Germany. Department of Sports Medicine, Institute for Sports and Sport Science, University of Frankfurt, 60487 Frankfurt, Germany. Department of Sports and Movement Medicine, Faculty of Psychology and Human Movement Sciences, University of Hamburg, 20148 Hamburg, Germany. Department of Prevention, Rehabilitation and Sports Medicine, Klinikum rechts der Isar, Technical University of Munich (TUM), 80992 Munich, Germany. DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80802 Munich, Germany. Public Health Nutrition Research Group, London Metropolitan University, London N7 8DB, UK. Institute of Cardiovascular Research and Sports Medicine, German Sport University Cologne, 50933 Cologne, Germany. KARDIOS, Cardiologists in Berlin, 10787 Berlin, Germany. Department of Endocrinology, Diabetes and Metabolism and Division of Laboratory Research, University Hospital Essen, University Duisburg-Essen, 45122 Essen, Germany. Department of Medicine, Division of Endocrinology, Medical University of Graz, 8010 Graz, Austria. Faculty of Medicine, University of Freiburg, 79117 Freiburg, Germany. Faculty of Medicine, Heinrich-Heine-University Düsseldorf, 40591 Düsseldorf, Germany.