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. 2015 Sep 18;12:107. doi: 10.1186/s12966-015-0264-7

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© Knai et al. 2015

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 5 — The type^a of interventions^b proposed. ^a Nuffield Council on Bioethics’s Ladder of Interventions [27]; ^b Numbers 1–22 correspond to interventions listed in Table 1