1. Department of Medicine, Division of Nephrology, University of Ottawa , Ottawa, ON K1H 8L6 , Canada
2. Clinical Epidemiology Program, Ottawa Hospital Research Institute , Ottawa, ON K1H 8L6 , Canada
3. Department of Medicine, Division of Endocrinology and Metabolism, Cumming School of Medicine, University of Calgary , Calgary, AB T2N 1N4 , Canada
4. Department of Community Health Sciences, Cumming School of Medicine, University of Calgary , Calgary, AB T2N 1N4 , Canada
5. Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School , Boston, MA 02115 , USA
6. Division of Metabolism, Endocrinology, and Diabetes, University of Michigan , Ann Arbor, MI 48109 , USA
7. Center for Adrenal Disorders, Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women's Hospital, Harvard Medical School , Boston, MA 02115 , USA