1. Department of Gastroenterology and Endocrinology, University Hospital Gießen and Marburg, Marburg, Germany
2. Hämatologisch-Onkologische Praxis, MVZ West GmbH, Würselen, Germany
3. Onkologie Unter-Ems, Leer, Germany
4. Unit of Endocrinology, Department of Medicine 1, University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany
5. Department of Endocrinology, Diabetes and Metabolism, Division of Laboratory Research, University Hospital Essen, Germany
6. Department of Medicine 1, Division of Endocrinology, Universitätsklinikum Erlangen, Erlangen, Germany
7. Department of Neuropathology, Pituitary Pathologist, University Hospital Eppendorf, Hamburg, Germany
8. Ipsen, Boulogne Billancourt, France
9. Ipsen, München, Germany
10. ENDOC Center for Endocrine Tumors, Hamburg, Germany