[1] Univ New England, Sch Rural Med, Armidale, NSW, Australia
[2] Australian Natl Univ, ANU Med Sch, Canberra, ACT, Australia
[3] Australian Natl Univ, Res Sch Populat Hlth, Canberra, ACT, Australia
[4] Univ Sydney, Sydney Med Sch, Ctr Disabil Studies, Sydney, NSW, Australia