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. 2020 Feb 28;9:43. doi: 10.1186/s13643-019-0983-y

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© The Author(s). 2020

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 — Benefits and harms of the HPV vaccines: flowchart of the inclusion of clinical study reports. For details on the correspondence and searches conducted in steps 1 to 6, see Jørgensen et al. ([36]: Appendices 1 and 2). Two hundred six studies were identified according to our inclusion and classification criteria, see Jørgensen et al. ([36]: Methods). N = the number of studies/entries evaluated