[1] La Trobe Univ, Austin Clin Sch Nursing, Heidelberg, Vic, Australia
[2] Univ Melbourne, Melbourne Sch Populat & Global Hlth, Parkville, Vic, Australia
[3] La Trobe Univ, Austin & Northern Clin Sch Nursing, Heidelberg, Vic, Australia
[4] Umea Univ, Dept Nursing, Umea, Sweden
[5] Austin Hosp, Dept Resp & Sleep Med, Heidelberg, Vic, Australia
[6] Univ Melbourne, Dept Med, Parkville, Vic, Australia
[7] St Vincents Hlth, Dept Psychiat, East Melboourne, Vic, Australia
[8] Univ Melbourne, Dept Psychiat, Parkville, Vic, Australia