1. Division of Gastroenterology, Department of Internal Medicine, University of Marmara Medical School, Istanbul 81326;
2. Department of Computer Engineering, Boğaziçi University, Istanbul 80815; Departments of
3. Nuclear Medicine,
4. Biochemistry,
5. Biostatistics, and
6. Physiology, University of Marmara Medical School, Istanbul 81326, Turkey; and
7. Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, DK-2100 Copenhagen; and
8. Department of Medical Physiology, The Panum Institute, University of Copenhagen, DK-2200 Copenhagen, Denmark