[1] CSI Holdsworth Mem Hosp, Mysore, India
[2] Univ Southampton, Southampton Gen Hosp, MRC Lifecourse Epidemiol Ctr, Southampton, England
[3] SickKids Res Inst, Toronto, ON, Canada
[4] Univ Toronto, Toronto, ON, Canada
[5] Univ Sherbrooke, Sherbrooke, PQ, Canada
[6] St Michaels Hosp, Toronto, ON, Canada
[7] Ctr Rech Ctr Hosp Univ Sherbrooke, Sherbrooke, PQ, Canada
[8] Fudan Univ, Shanghai, Peoples R China
[9] Shanghai Jiao Tong Univ, Shanghai, Peoples R China
[10] Lunenfeld Tanenbaum Res Inst, Toronto, ON, Canada
[11] Univ Witwatersrand, Johannesburg, South Africa
[12] Univ Southampton, MRC Lifecourse Epidemiol Ctr, Southampton Gen Hosp, Southampton SO16 6YD, England