According to instructions from UpToDate, cite the UpToDate topic as a chapter in a book titled UpToDate, edited by Ted. W. Post, published by UpToDate in Waltham, MA. There are no page numbers to cite, and the publication year for any topic should be the current year. Since UpToDate is an online resource, treat it as a chapter in an E-book. The rule for citing an E-book chapter in JAMA/AMA format is:
Authors’ surnames and initials or name of the group if the author is a group. Chapter title. In: Editor(s). Title of Database. Publisher’s name. Year of publication and/or version number. Chapter number (or inclusive pages if available). Accessed date. URL
Example: Aberg JA, Cespedes MS. HIV and women. In: Post T, ed. UpToDate. UpToDate, Inc.; 2020. Topic 3753 Version 43.0. Accessed January, 24, 2020. https://www.uptodate.com.
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