. 2020 Jan 28;7:416. doi: 10.3389/fpubh.2019.00416
Copyright © 2020 Czech, Baran-Kooiker, Atikeler, Demirtshyan, Gaitova, Holownia-Voloskova, Turcu-Stiolica, Kooiker, Piniazhko, Konstandyan, Zalis'ka and Sykut-Cegielska.
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Figure 1.
Reproduced with permission from PRISMA 2009 flow diagram (27).