1. Department of Preventive and Social Medicine, Dunedin School of Medicine; University of Otago; New Zealand
2. Department of Geography; University of Otago; New Zealand
3. Department of Medicine, Dunedin School of Medicine; University of Otago; New Zealand
4. Department of Marketing; University of Otago; New Zealand
5. Biostatistics Unit, Dunedin School of Medicine; University of Otago; New Zealand