1. School of Medicine, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
2. University Centre for Rural Health, Western Sydney University, 61 Uralba Street, Lismore, NSW 2480, Australia
3. Harm Reduction and Health Promotion Programs, HIV and Related Programs (HARP), North Coast Public Health, Mid-North Coast Local Health District, P.O. Box 419, Lismore, NSW 2480, Australia