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. 2019 Jan 16;16:1. doi: 10.1186/s12981-019-0217-3

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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 — Selection of eligible patients for analysis. ¹As of July 31, 2016, ²Pre-screening period: 01 Jan 1999 to 14 June 2008, ³Post-screening period: 15 June 2008 to 31 July 2016