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. 2016 Oct 19;16:591. doi: 10.1186/s12913-016-1834-3

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© The Author(s). 2016

Open AccessThis 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. 1 — Radar plot showing the extent to which the data supports each construct of NPT. Closer proximity of the shaded area to the outer line of the circle indicates greater strength, and closer proximity of the shaded area to the centre of the circle represents lesser strength, assigned to that construct