About the Authors

Christopher Harrison

christopher.harrison@sydney.edu.au

Affiliation Family Medicine Research Centre, Sydney School of Public Health, University of Sydney, Parramatta, NSW, Australia

Helena Britt

Affiliation Family Medicine Research Centre, Sydney School of Public Health, University of Sydney, Parramatta, NSW, Australia

Graeme Miller

Affiliation Family Medicine Research Centre, Sydney School of Public Health, University of Sydney, Parramatta, NSW, Australia

Joan Henderson

Affiliation Family Medicine Research Centre, Sydney School of Public Health, University of Sydney, Parramatta, NSW, Australia

Competing Interests

The BEACH program from which the data for this study is drawn is supported by a consortium of industry and government bodies. The funding organisations during the period the data for this study was collected were: The Australian Government Department of Health and Ageing, the Australian Institute of Health and Welfare, AstraZeneca Pty Ltd (Australia), Janssen-Cilag Pty Ltd, Merck Sharp and Dohme (Australia) Pty Ltd, Pfizer Australia, Abbott Australiasia Pty Ltd, Sanofi-Aventis Australia Pty Ltd, Wyeth Australia Pty Ltd, Novartis Pharmaceuticals Australia Pty Ltd, GloxoSmithKline Australia Pty Ltd and the Australian Government Department of Veterans' Affairs. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: CH HB GM JH. Performed the experiments: CH HB GM JH. Analyzed the data: CH. Contributed reagents/materials/analysis tools: CH JH. Wrote the paper: CH HB GM JH.