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Over the years, some teachers and editors have said they do not trust the information on the website, Wikipedia. They say some of the people who provide the pieces for the website may not be qualified to write them. But, recently, an American medical school has provided an unusual course meant to aid doctors and other Wikipedia users. Students at the medical school of the University of California, San Francisco are taking a class that teaches them how to write and edit for the WikiProject Medicine part of Wikipedia. Dr. Amin Azzam, a health sciences associate clinical professor, leads the course. Dr. Azzam asks his students to read Wikipedia, identify missing information and update pieces on the site. He says the students need to do this from their own medical knowledge and from dependable medical sources. Fourth-year medical student Raquel Kronen signed up to take the course. She has medical knowledge. Still, her writing needs improvement. Ms. Kronen says you need both skills to be a Wikipedia editor. Students first attend some intensive classes. A guide explains how to present material on Wikipedia. The writing must be understandable to people who read at the sixth-grade level. The piece must open with a four-sentence paragraph. All sentences must be less than 24 words. The writing also needs to be simple because the articles are translated into 100 languages. Dr. Azzam says editing for the online encyclopedia should be taught in every medical school. Still, he tells people that it is best to confirm its information with other sources — including doctors.