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Correspondence: s.karlsen@ucl.ac.uk Department of Epidemiology & Public Health, UCL, 1-19 Torrington Place, London WC1E 6BT, UK
The authors wish to thank Gianluca Baio, Tarani Chandola and Paola Zaninotto for their statistical advice during the drafting of this paper.
We also wish to thank Imelda Balchin and Wendy Pollock for their comments on an earlier draft of this paper.
All authors want to declare (1) Financial support for SK for the submitted work from the WHO.
Other authors received no financial support for the submitted work from anyone other than their employer.
All authors also declare (2) No financial relationships with commercial entities that might have an interest in the submitted work; (3) No spouses, partners, or children with relationships with commercial entities that might have an interest in the submitted work; (4) No non-financial interests that may be relevant to the submitted work.
The authors state their independence from the funders of this work.
The funding sources had no role in the study design, analysis or interpretation, the writing of the report or decision to submit the paper for publication.
The opinions stated in this paper are those of the authors as individuals, independent from the funding sources.
They not necessarily represent the views of the World Health Organization or its member countries.
SK was funded by the WHO to undertake this research. RR is partly funded by the NIHR UCLH/UCL Comprehensive Biomedical Research Centre. LS, JPS and AMG are WHO staff.
© 2011 Karlsen et al; licensee BioMed Central Ltd.