1. Department of Human Genetics, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA
2. Longitudinal Studies Section, Translational Gerontology Branch, National Institute on Aging, National Institutes of Health, USA, Baltimore, MD 21224, USA
3. Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
4. Geriatric Unit, Azienda Toscana Centro, Florence, Italy
5. Center for Population Epigenetics, Robert H. Lurie Comprehensive Cancer Center and Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
6. Laboratory of Environmental Epigenetics, Departments of Environmental Health Sciences and Epidemiology, Columbia University Mailman School of Public Health, New York, NY 10032, USA
7. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
8. Department of Genetics, Department of Biostatistics, Department of Computer Science, University of North Carolina, Chapel Hill, NC 27599, USA
9. Department of Medicine, School of Medicine, University of North Carolina, Chapel Hill, NC 27599, USA
10. Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS 39216, USA
11. Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
12. Center of Human Development and Aging, New Jersey Medical School, Rutgers State University of New Jersey, Newark, NJ 07103, USA
13. Department of Epidemiology & Prevention, Division of Public Health Sciences, Wake Forrest School of Medicine, Winston-Salem, NC 27157, USA
14. Department of Biostatistics, Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA 90095, USA