1. Department of Nuclear Medicine, University Hospital Essen, Essen, Germany
2. General Paediatrics, University Hospital Düsseldorf, Düsseldorf, Germany
3. Nordstadt, Neurosurgery, Hospital Region Hannover, Hannover, Germany
4. Neurosurgery, University Hospital Hamburg-Eppendorf, Hamburg, Germany
5. Division of Endocrinology, Medical Center, University Hospital Essen, Essen, Germany
6. ENDOC, Center for Endocrine Tumors, Hamburg, Germany