[1] Univ Hosp Geneva, Dept Community Med & Primary Care, CH-1211 Geneva, Switzerland
[2] Univ Geneva, CH-1211 Geneva, Switzerland
[3] Univ Melbourne, Dept Gen Practice, Carlton, Vic 3053, Australia
[4] Royal Childrens Hosp, Ctr Adolescent Hlth, Melbourne, Vic, Australia
[5] Royal Childrens Hosp, Murdoch Childrens Res Inst, Melbourne, Vic, Australia
[6] Univ Melbourne, Dept Paediat, Melbourne, Vic, Australia