1. Department of Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada
2. Toronto General Research Institute, University Health Network, University of Toronto, Toronto, Ontario, Canada
3. Department of Physiology, Banting and Best Diabetes Centre, University of Toronto, Toronto, Ontario, Canada
4. Department of Internal Medicine IV, Endocrinology, Metabolism, Pathobiochemistry and Clinical Chemistry, University Hospital Tuebingen, Tuebingen, Germany
5. Division of Molecular Physiology Unit, Faculty of Life Sciences, University of Dundee, Dundee, United Kingdom