German-Language Websites Containing Information About Rare Diseases Lack Quality Indicators / Pauer, F., Litzkendorf, S., Göbel, J., Storf, H., Zeidler, J., & Graf von der Schulenburg, J.-M. (2017). Rare diseases on the Internet: An assessment of the quality of online information. Journal of Medical Internet Research, 19(1), e23. https://doi.org/10.2196/jmir.7056 - Koos, Jessica A. (Evidence Based Library and Information Practice, 2020)