1. Department of Twin Research and Genetic Epidemiology (G.L., B.S.K., T.D.S.), Unit St. Thomas’ Hospital, Kings College London, London SE1 7EH, United Kingdom
2. Department of Sackler Faculty of Medicine (G.L.), Tel Aviv University, Tel Aviv 69978, Israel
3. Department of Endocrinology and Diabetes (S.G.W.), Sir Charles Gairdner Hospital, Nedlands, Western Australia 6009