1. Department of Medicine, University of Manitoba, Winnipeg, Manitoba R3E 3P5, Canada
2. Department of Medicine, University of Alberta, Edmonton, Alberta T6G 2G3, Canada
3. Department of Medicine, McGill University, Montreal, Quebec H4A 3J1, Canada
4. Centre for Metabolic Bone Diseases, University of Sheffield Medical School, Sheffield S10 2RX, United Kingdom
5. Institute for Health and Aging, Catholic University of Australia, Melbourne, Victoria 3000, Australia