Salway et al. BMC Public Health 2011, 11:514 http://www.biomedcentral.com/1471-2458/11/514 Hamburg, D-20359, Germany. 4Leeds Institute of Health and Social Work, School of Healthcare, University of Leeds, Baines Wing, Leeds, LS2 9JT, UK. 5Op de Elg 52, 22393 Hamburg, Germany. 6Department of Public Health Sciences, University of Alberta, University Terrace, 8303-112 Street, Edmonton, T6G 2T4, Canada. Authors’ contributions SS was PI on the project, produced the first draft and finalised the manuscript. GH and BR were country leads for the project, contributed to design and execution of the work, and provided critical input to the manuscript. KB, PC, CF, JF, KG, ZM and BO’B were all team members on the project contributing to the generation and interpretation of the data. All provided critical input to the manuscript. All authors read and approved the final manuscript. Declaration of competing interests The authors declare that they have no competing interests. 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