Wikipedia is a free online Encyclopedia, and the most unique part is that Wikipedia is created by web users around the world. Readers can find almost everything on it, and if one can’t find the articles, he/she can create the articles themselves.
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*Jona Kräenbring, Tika Monzon Penza, Joanna Gutmann, Susanne Muehlich, Oliver Zolk, Leszek Wojnowski, Renke Maas, Stefan Engelhardt, Antonio Sarikas. Accuracy and Completeness of Drug Information in Wikipedia: A Comparison with Standard Textbooks of Pharmacology.