1 Centre of Reproductive Medicine and Andrology, University Hospital Münster, Münster, Germany.
2 Professor Emeritus of Endocrinology, Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy.
3 Emeritus Professor of Medicine and Endocrinology, Division of Endocrinology, Diabetes & Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.
4 Institute of Biomedicine, Research Centre for Integrative Physiology and Pharmacology, and Centre for Population Health Research, University of Turku, Turku, Finland.
5 Department of Pediatrics, Turku University Hospital, Turku, Finland.
6 Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Italy.