Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany. Electronic address: katharina.schilbach@med.uni-muenchen.de. Department of Internal medicine and clinical nutrition, Sahlgrenska academy, University of Gothenburg, Department of Endocrinology, Sahlgrenska University Hospital, Gothenburg, Sweden. Department of Pediatrics, Endocrine Division (SEMPR), Federal University of Paraná, Curitiba, Brazil. Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany. Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark.