[1] Univ London London Sch Hyg & Trop Med, Fac Publ Hlth & Policy, Keppel St, London WC1E 7HT, England
[2] Leverhulme Ctr Integrat Res Agr & Hlth LCIRAH, 36 Gordon Sq, London WC1H 0PD, England
[3] Minist Hlth & Med Serv, Natl Food & Nutr Ctr, POB 2450,Govt Bldg, Suva, Fiji
[4] Fiji Natl Univ, C POND, Coll Med Nursing & Hlth Sci, Tamavua Campus, Suva, Fiji
[5] Deakin Univ, Suva, Fiji
[6] Deakin Univ, Sch Exercise & Nutr Sci, 221 Burwood Highway, Burwood, Vic 3125, Australia
[7] Univ London London Sch Hyg & Trop Med, Fac Epidemiol & Populat Hlth, Keppel St, London WC1E 7HT, England
[8] Cornell Univ, Div Nutr Sci, Savage Hall, Ithaca, NY 14850 USA