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. 2017 Jul 28;15:151. doi: 10.1186/s12955-017-0721-x

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© The Author(s). 2017

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 — Dataset reduction diagram. A total of 4449 patients with 20,048 observations were present in PsoReg at the time of the data extraction. One patient was excluded due to an illogical height/weight value, and another 580 patients were removed due to missing covariate data resulting in 3868 patients with a total of 15,238 observations. In order to be included in the longitudinal analysis, at least two observations were required. 1194 did not meet this requirement. The final analysis population contained 2674 patients with a total of 14,044 observations