[1] Canc Council New S Wales, Canc Epidemiol Res Unit, Sydney, NSW, Australia
[2] Univ Sydney, Sydney Med Sch, Sydney Sch Publ Hlth, Sydney, NSW 2006, Australia
[3] Australian Natl Univ, Natl Ctr Epidemiol & Populat Hlth, Canberra, ACT, Australia
[4] Univ New S Wales, Fac Med, Kirby Inst, Sydney, NSW, Australia
[5] Karolinska Inst, Dept Med Epidemiol & Biostat, Stockholm, Sweden