1. Diabetes and Vascular Medicine (A.L.G., E.L.E., L.W.H., A.T.H., S.E.), Peninsula Medical School, Exeter EX2 5AX, United Kingdom
2. Department of Pediatrics (E.A.C., R.S.), Dalhousie University and IWK Health Centre, Halifax B3K 6R8, Canada
3. Department of Pediatrics (T.C.), Ste. Justine Hospital, Universite de Montreal, Montreal H3T 1C5, Canada
4. Wessex Clinical Genetics Service and Division of Human Genetics (I.K.T.), Southampton University and Hospitals National Health Service Trust, Southampton SO16 5YA, United Kingdom