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DATA SOURCES: Relevant English- and non-English-language articles were identified from PreMEDLINE and MEDLINE (1966-2003), EMBASE (1980-2003), CINAHL (1982-2003), BIOSIS (1990-2003), the Cochrane Library (2002, Issue 3), the Science Citation Index database, reference lists of included studies, and experts. The BIOSIS Previews manual, for example, gives theoretical examples of this kind. Searching of other major biomedical databases, including BIOSIS, EMBASE, and the Science Citation Index, is also important. |
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