1. Cancer Society of New Zealand Social and Behavioural Research Unit, Department of Preventive and Social Medicine; University of Otago; PO Box 56 Dunedin 9054 New Zealand
2. Department of Preventive and Social Medicine; University of Otago; PO Box 56 Dunedin 9054 New Zealand
3. Health Promotion Agency; PO Box 2142 Wellington 6140