[1] Univ Southampton, MRC Lifecourse Epidemiol Unit, Southampton, Hants, England
[2] Univ Southampton, Inst Dev Sci, Southampton, Hants, England
[3] Univ Auckland, Liggins Inst, Auckland 1, New Zealand
[4] AgResearch, Ruakura Res Ctr, Hamilton, New Zealand
[5] Singapore Inst Clin Sci, SICS, Singapore, Singapore