1. Clinic of Gastroenterology and Gastrointestinal Oncology University Medical Center Goettingen Goettingen Germany
2. ENDOKRINOLOGIKUM Saarbrücken Saarbrücken Germany
3. MVZ Endokrinologikum Goettingen Goettingen Germany
4. Department of Psychosomatic Medicine and Psychotherapy University Medical Center Goettingen Goettingen Germany
5. Institute for Medical Statistics University Medical Center Goettingen Goettingen Germany