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[GRADE guidelines: 18. How ROBINS-I and other tools to assess risk of bias in nonrandomized studies should be used to rate the certainty of a body of evidence].
Morche J, Freitag S, Hoffmann F, Rissling O, Langer G, Nußbaumer-Streit B, Toews I, Gartlehner G, Meerpohl JJ. Morche J, et al. Z Evid Fortbild Qual Gesundhwes. 2020 Apr;150-152:124-133. doi: 10.1016/j.zefq.2019.11.003. Epub 2020 Jan 22. Z Evid Fortbild Qual Gesundhwes. 2020. PMID: 31980320 German.
[GRADE guidelines: 7. Rating the quality of evidence - inconsistency].
Perleth M, Langer G, Meerpohl JJ, Gartlehner G, Kaminski-Hartenthaler A, Schünemann HJ. Perleth M, et al. Z Evid Fortbild Qual Gesundhwes. 2012;106(10):733-44. doi: 10.1016/j.zefq.2012.10.018. Epub 2012 Nov 16. Z Evid Fortbild Qual Gesundhwes. 2012. PMID: 23217727 Review. German.
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