1. Department of Medicine, Division of Endocrinology Columbia University Irving Medical Center New York NY USA
2. Department of Clinical Pathology and Cell Biology Columbia University New York NY USA
3. Regional Bone Center, Helen Hayes Hospital West Haverstraw NY USA
4. Institute for Biomechanics, ETH Zurich Zurich Switzerland
5. Department of Medicine, Division of Nephrology Columbia University Irving Medical Center New York NY USA
6. Division of Endocrinology Hospital for Special Surgery New York NY USA
7. Department of Medicine, Division of Endocrinology Creighton University school of Medicine Omaha NE USA
8. Department of Medicine and College of Nursing Creighton University school of Medicine Omaha NE USA