[1] Melbourne E Gen Practice Network, Blackburn, Vic, Australia
[2] Australian Natl Univ, Sch Med, Acad Unit Gen Practice & Community Hlth, Canberra, ACT 0200, Australia
[3] Australian Gen Practice Network, Manuka, ACT, Australia
[4] Univ Manchester, Natl Ctr Primary Care Res Dev Ctr, Manchester, Lancs, England