1. Institute of Clinical Chemistry and Pathobiochemistry, Charité – Campus Benjamin Franklin, Hindenburgdamm 30, 12200 Berlin, Germany
2. Institute of Biochemistry, Deutscher Platz 6, 04103 Leipzig, Germany
3. Institute of Biochemistry, Fabeckstrasse 36A, 14195 Berlin, Germany
4. Department of Gastroenterology, Charité – Campus Benjamin Franklin, Hindenburgdamm 30, 12200 Berlin, Germany
5. Institute of Clinical Physiology, Charité – Campus Benjamin Franklin, Hindenburgdamm 30, 12200 Berlin, Germany