1. Division of Laboratory Medicine, Department of Pathology and Cell Biology, Vagelos College of Physicians and SurgeonsColumbia University Irving Medical Center New York NY USA
2. Division of Endocrinology, Department of Medicine, Vagelos College of Physicians and SurgeonsColumbia University Irving Medical Center New York NY USA
3. Department of Endocrinology and Kogod Center of AgingMayo Clinic College of Medicine Rochester MN USA
4. Department of ChemistryUniversity of Rochester Rochester NY USA
5. Mellanby Centre for Bone Research, Medical SchoolUniversity of Sheffield UK
6. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal SciencesThe Oxford University Institute of Musculoskeletal Sciences, The Botnar Research Centre, Nuffield Orthopaedic Centre Oxford UK