Group of Skeletal, Mineral and Gonadal Endocrinology, Department of Growth and Reproduction, Rigshospitalet, Copenhagen, 2100, Denmark. Department of Growth and Reproduction and International Center for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Copenhagen University Hospital - Rigshospitalet, Copenhagen, 2100, Denmark. Section of Biostatistics, Faculty of Health Sciences, University of Copenhagen, 1014, Denmark. Center for Clinical Metabolic Research, Gentofte Hospital, University of Copenhagen, Hellerup, 2900, Denmark. Steno Diabetes Center Copenhagen, Gentofte, 2820, Denmark. Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, 2200, Denmark. Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, 2200, Denmark. Division of Bone and Mineral Research, Harvard School of Dental Medicine/Harvard Medical School, Harvard University, Boston, Massachusetts 02115, USA.