BMC Public Health 2009, 9:1 http://www.biomedcentral.com/1471-2458/9/1 MBR made substantial contributions to analysis and interpretation of data, was involved in drafting the manuscript, revised it critically for important intellectual content and gave final approval of the version to be published. CNL was involved in drafting the manuscript, revised it critically for important intellectual content and gave final approval of the version to be published. MAGM made substantial contributions to conception and design, acquisition of data, analysis and interpreta- tion of data; was involved in drafting the manuscript, revised it critically for important intellectual content and gave final approval of the version to be published. Acknowledgements We thank all members of the SUN Study Group for administrative, technical and material support. We thank participants of the SUN Study for continued cooperation and participation. 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