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. 2019 Jun 7;19:58. doi: 10.1186/s12902-019-0383-2

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© The Author(s). 2019

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 — Flow diagram describing the selection strategy. The participants were 18–80 years old. Reference ranges for thyroid-stimulating hormone (TSH): 0.35–4.94 μIU/ml, free triiodothyronine (fT3): 1.71–3.71 pg/ml, free thyroxine (fT4) 0.7–1.48 ng/dl=