[1] Univ Sydney, Univ Ctr Rural Hlth, Lismore, NSW 2480, Australia
[2] So Cross Univ, Lismore, NSW 2480, Australia
[3] N Coast NSW Medicare Local, Lismore, NSW 2480, Australia
[4] N Coast Area Hlth Serv, Lismore, NSW 2480, Australia
[5] Griffith Univ, Sch Med, Southport, Qld 4215, Australia