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. 2019 May 18;20:93. doi: 10.1186/s12931-019-1061-7

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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 — CONSORT type flow chart of inclusions and follow up. Drop outs are indicated immediately after the last attended visit. In case of decease, this is also indicated after the last attended visit by the subject, even if the decease occurred at a later stage. The number of deceases between two visits are included in the number of drop outs and are specified within brackets