1. 1Department for Nuclear Medicine, Klinikum Lüdenscheid, Lüdenscheid, Germany
2. 2North Lakes Clinical, Ilkley, UK
3. 3Medical Department I, Endocrinology and Diabetology, Bergmannsheil University Hospitals, Ruhr University of Bochum, Bochum, Germany
4. 4Ruhr Center for Rare Diseases (CeSER), Ruhr University of Bochum and Witten/Herdecke University, Bochum, Germany