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Boeker M, Motschall E, Vach W. Literature search methodology for systematic reviews: conventional and natural language processing enabled methods are complementary (Letter commenting on: J Clin Epidemiol. 2015;68:191-9). J Clin Epidemiol. 2016;69:255-7.

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Boeker M, Vach W, Motschall E. Semantically equivalent PubMed and Ovid-MEDLINE queries: different retrieval results because of database subset inclusion. J Clin Epidemiol. 2012;65(8):915-6.

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Boeker M, Vach W, Motschall E. Time-dependent migration of citations through PubMed and OvidSP subsets: a study on a series of simultaneous PubMed and OvidSP searches. Stud Health Technol Inform. 2013;192:1196. Abstract