1. and Department of Respiratory Medicine, Royal Melbourne Hospital; Department of Haematology and Medical Oncology, Peter MacCallum Cancer Institute, St Andrew's Place, East Melbourne 3002, Victoria; Melbourne Australia
2. University of Auckland; Obstetrics and Gynaecology; Private Bag 92019 Auckland New Zealand 1142
3. Royal Melbourne Hospital; Respiratory and Sleep Medicine; Grattan Street Parkville Victoria Australia 3050
4. Department of Human Services, Victoria; Prevention and National Health Priorities; level 17, 120 Spencer Street Melbourne Victoria Australia 3000
5. International Agency for Research on Cancer; Biostatistics Group; Lyon France
6. Monash University; Epidemiology & Preventive Medicine; School of Public Health & Preventive Medicine The Alfred Melbourne Victoria Australia 3004
7. Monash Medical Centre; Head of General Medicine, Southern Health; Level 1, Block E Clayton Victoria Australia 3168