About the Authors

Christopher Harrison

christopher.harrison@sydney.edu.au

Affiliations Menzies Centre for Health Policy, Sydney School of Public Health, University of Sydney, Sydney, New South Wales, Australia, Family Medicine Research Centre, Sydney School of Public Health, University of Sydney, Sydney, New South Wales, Australia

Joan Henderson

Affiliation Family Medicine Research Centre, Sydney School of Public Health, University of Sydney, Sydney, New South Wales, Australia

Graeme Miller

Affiliation Family Medicine Research Centre, Sydney School of Public Health, University of Sydney, Sydney, New South Wales, Australia

Helena Britt

Affiliation Family Medicine Research Centre, Sydney School of Public Health, University of Sydney, Sydney, New South Wales, Australia

Competing Interests

We have the following interests: This study was a sub-study of the BEACH project. The overall BEACH project was funded in part by AstraZeneca Pty Ltd (Australia), Merck, Sharp and Dohme (Australia) Pty Ltd, Pfizer Australia Pty Ltd, Sanofi-Aventis Australia Pty Ltd, Novartis Pharmaceuticals Australia Pty Ltd, GlaxoSmithKline Australia Pty Ltd, Seqirus (Australia) Pty Ltd (then bioCSL (Australia) Pty Ltd), Bayer Australia Ltd, AbbVie Pty Ltd. There are no patents, products in development or marketed products to declare. This does not alter our adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceptualization: CH HB JH GM. Data curation: CH. Formal analysis: CH. Funding acquisition: CH HB JH GM. Investigation: CH HB JH GM. Methodology: CH HB JH GM. Project administration: CH HB JH GM. Resources: CH JH. Software: CH. Supervision: HB JH GM. Validation: CH. Visualization: CH. Writing – original draft: CH. Writing – review & editing: CH HB GM JH.