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Contributors NP prepared the first draft of the paper. HK revised it. Both authors contributed to subsequent revisions.
Funding The Centre for Global NCDs is supported by the Wellcome Trust Institutional Strategic Support Fund, 097834/Z/11/B. The Centre for Public Health Research is supported by a Programme Grant from the Health Research Council of New Zealand.
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.