1. Division of Endocrinology and Metabolism, Department of Medicine, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada.
2. Research Division, Joslin Diabetes Center, Boston, Massachusetts.
3. Departments of Ophthalmology and Vision Sciences and of Medicine, University of Toronto, Toronto, Ontario, Canada.
4. Joint Department of Medical Imaging, Division of Cardiothoracic Radiology, University Health Network, Toronto, Ontario, Canada.
5. The Ellen and Martin Prosserman Centre for Neuromuscular Diseases, Krembil Neuroscience Centre, Division of Neurology, Department of Medicine, University Health Network, University of Toronto, Toronto, Ontario, Canada.
6. Division of Nephrology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada.