1Department of Clinical Chemistry, University of Liège, CHU Sart-Tilman, Domaine du Sart-Tilman, B‐4000 Liège, Belgium
2Mellanby Centre for Bone Research, University of Sheffield, Sheffield, UK
3Department of Clinical Biochemistry, Rigshospitalet, 2600 Glostrup, Denmark
4Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
5Clinical Biochemistry Department, KAT General Hospital, 14561 Athens, Greece
6Laboratory for Research of the Musculoskeletal System “Th. Garofalidis”, Medical School, University of Athens, 14561 Athens, Greece
7PathWest Laboratory Medicine, Fiona Stanley Hospital, Murdoch, WA 6150, Australia
8Centre for Metabolic Bone Diseases, University of Sheffield Medical School, Beech Hill Road, Sheffield S10 2RX, UK
9The MRC Epidemiology Resource Centre, Southampton General Hospital, University of Southampton, Southampton SO16 6YD, UK
10Department of Public Health and Primary Care, KU Leuven Campus Kulak Kortrijk, Kortrijk, Belgium
11School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, SA 5000, Australia
12Mary McKillop Institute for Health Research, Australian Catholic University, Melbourne, Australia