[1] Royal North Shore Hosp, Northern Sydney Hlth Dist, Dept Child & Youth Mental Hlth, Herbert St, Sydney, NSW 2065, Australia
[2] Queens Univ, Sch Nursing & Midwifery, Belfast, Antrim, North Ireland
[3] UNSW Sydney, Sydney, NSW, Australia
[4] Hlth & Social Care Board, Think Family NI, Belfast, Antrim, North Ireland
[5] Akershus Univ Hosp, Mental Hlth Div, Dept Res & Dev, Lorenskog, Norway
[6] OsloMet Oslo Metropolitan Univ, Fac Hlth Sci, Dept Nursing & Hlth Promot, Oslo, Norway