[1] Univ Southampton, MRC Lifecourse Epidemiol Ctr, Southampton, Hants, England
[2] London Sch Hyg & Trop Med, Dept Infect Dis Epidemiol, Fac Epidemiol & Populat Hlth, London, England
[3] Monash Univ, Dept Med, Monash Hlth, Sch Clin Sci, Clayton, Vic, Australia
[4] Univ Witwatersrand, MRC Wits Rural Publ Hlth & Hlth Transit Res Unit, Sch Publ Hlth, Fac Hlth Sci, Johannesburg, South Africa
[5] Univ Pittsburgh, Pittsburgh, PA USA
[6] Jean Mayer USDA Human Nutr Res Ctr Aging, Nutr Exercise Physiol & Sarcopenia Lab, Boston, MA USA
[7] Univ Bristol, Bristol Med Sch, Musculoskeletal Res Unit, Bristol, Avon, England