[1] Uppsala Univ, Dept Womens & Childrens Hlth, S-75236 Uppsala, Sweden
[2] Univ New South Wales, Sch Psychiat, Kensington, NSW 2052, Australia
[3] South Western Sydney Local Hlth Dist & Ingham Ins, Acad Unit Child Psychiat, Sydney, NSW 2170, Australia
[4] Ingham Inst, Sydney, NSW 2170, Australia
[5] Univ Catania, Dept Clin & Expt Med, I-95124 Catania, Italy
[6] South Western Sydney Local Hlth Dist, Mental Hlth Res Unit, Liverpool, NSW 2170, Australia