[1] Childrens Hosp Westmead, Dept Adolescent Med, Sydney, NSW, Australia
[2] Univ Sydney, Sydney Med Sch, Discipline Child & Adolescent Hlth, Sydney, NSW, Australia
[3] Univ Sydney, Fac Med & Hlth, Susan Wakil Sch Nursing & Midwifery, Sydney, NSW, Australia
[4] Flinders Univ S Australia, Coll Med & Publ Hlth, Flinders Human Behav & Hlth Res Unit, Adelaide, SA, Australia
[5] Childrens Hosp Westmead, Acad Dept Adolescent Med, Sydney, NSW, Australia