1Genetics of Complex Traits, Peninsula Medical School, Exeter, UK
2Longitudinal Studies Section, Clinical Research Branch, National Institute on Aging, National Institutes of Health, Bethesda, USA
3Geriatric Unit, Azienda Sanitaria di Firenze, Florence, Italy
4Laboratory of Epidemiology, Demography and Biometry, National Institute on Aging, National Institutes of Health, Bethesda, USA
5Johns Hopkins University School of Medicine, Baltimore, USA
6Broad Institute of MIT and Harvard, Cambridge, USA
7Department of Biostatistics and Center for Statistical Genetics, University of Michigan, Ann Arbor, USA
8Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Oxford, UK
9Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, UK
10Wellcome Trust Sanger Institute, Cambridge, UK