[1] Univ Newcastle, Fac Hlth & Med, Sch Nursing & Midwifery, Port Macquarie Campus,POB 210, Port Macquarie, NSW 2444, Australia
[2] Univ Newcastle, Fac Hlth & Med, Sch Med & Publ Hlth, Newcastle, NSW, Australia
[3] Flinders Univ S Australia, Coll Nursing & Hlth Sci, Bedford Pk, SA, Australia
[4] Hunter Med Res Inst, New Lambton Hts, Australia
[5] Univ Newcastle, Prior Res Ctr Hlth Behav, Newcastle, NSW, Australia