1. 1Section of Endocrinology, University of Siena, Siena, Italy
2. 2Department of Endocrinology, Diabetes and Metabolism, West German Cancer Centre (WTZ), University Hospital Essen, University Duisburg-Essen, Essen, Germany
3. 3Section of Endocrinology, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
4. 4Department of Nuclear Medicine and Endocrine Oncology, Maria Skłodowska-Curie National Research Institute of Oncology, Gliwice Branch, Gliwice, Poland
5. 5Gustave Roussy Cancer Campus and University Paris-Saclay, Villejuif, Cedex, France
6. 6Department of Nuclear Medicine, University Hospital Marburg, Marburg, Germany
7. 7Radboud University Medical Center, Nijmegen, Netherlands