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