Becker, M. ., Breuing, J. ., Nothacker, M. ., Deckert, S. ., Steudtner, M. ., Schmitt, J. ., … Pieper, D. . (2018). Guideline-based quality indicators-a systematic comparison of German and international clinical practice guidelines: protocol for a systematic review. Systematic Reviews, 7(1), 5. https://doi.org/10.1186/s13643-017-0669-2 (Original work published 2018)