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. 2016 Sep 15;16:976. doi: 10.1186/s12889-016-3622-8

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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. 2 — Flowchart of the selection of study participants. Right column shows the number (n) of participants excluded according to each criterion. 2300 of the citizens in the age group did not return the survey questionnaire and 149 did not answer all of the 12 items in the SF-12