[1] Univ Auckland, Sch Populat Hlth, Auckland, New Zealand
[2] Univ New South Wales, Kirby Ctr, Sydney, NSW, Australia
[3] New Zealand Drug Fdn, Wellington, New Zealand
[4] Univ Auckland, Ctr Addict Res CFAR, Auckland, New Zealand
[5] New Zealand AIDS Fdn, Auckland, New Zealand
[6] Body Posit, Auckland, New Zealand
[7] New Zealand Needle Exchange Programme, Christchurch, New Zealand
[8] Drugs Hlth & Dev Project, Wellington, New Zealand
[9] Te Whariki Takapou, Waikato, New Zealand