1. Department of Clinical Biochemistry, The Children’s Memorial Health Institute, 04-730 Warsaw, Poland
2. Sunlight, Nutrition, and Health Research Center, P.O. Box 641603, San Francisco, CA 94164-1603, USA
3. Laboratory of Biological Chemistry, Medical School, Aristotle University, 54636 Thessaloniki, Greece
4. Clinic for Thoracic and Cardiovascular Surgery, Herz- und Diabeteszentrum Nordrhein-Westfalen (NRW), Ruhr University Bochum, 32545 Bad Oeynhausen, Germany
5. Department of Internal Medicine, Division of Endocrinology and Diabetology, Medical University of Graz, Auenbruggerplatz 15, 8036 Graz, Austria