1. General Medicine Division, Massachusetts General Hospital, Boston, Massachusetts;
2. Harvard Medical School, Boston, Massachusetts;
3. Departamento de Medicina Interna, Hospital General Universitario “Gregorio Marañón”, Madrid, Spain;
4. Department of Mathematics, Boston University, Boston, Massachusetts;
5. National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, Massachusetts;
6. Department of Biostatistics, Boston University School of Public Health, Boston, Massachusetts;
7. Diabetes Unit and Center for Human Genetic Research, Massachusetts General Hospital, Boston, Massachusetts;
8. Program in Medical and Population Genetics, Broad Institute, Cambridge, Massachusetts.