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. 2011 Nov 29;343:d7434. doi: 10.1136/bmj.d7434

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© Sedrakyan et al 2011

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/2.0/ and http://creativecommons.org/licenses/by-nc/2.0/legalcode.

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graphic file with name seda890186.f3_default.jpg — Fig 3 Qualitative evidence reported in six national data sources/registries (Australia, New Zealand, England and Wales, Italy (Emilia-Romagna), Kaiser and CMS databases)