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Studies were identified by searching Medline (1966–99), HealthSTAR (1981–99), CINAHL (1982–99), Current Contents (1997–9), EMBASE/Excerpta Medica (1990–9), INSPEC (1969–99), PsycINFO (1967–99), Sociological Abstracts (1986–99), the Cochrane Library, Science Citation Index Expanded, Social Sciences Index, Computer Retrieval of Information on Scientific Projects, Dissertation Abstracts, internet, and LEXIS-NEXIS. Key individuals were contacted, bibliographies of articles and reviews were scanned, and key journals were handsearched.
English language studies …
Source of funding: not stated.
For correspondence: Ms D Revere, University of Washington, IAIMS Program, Box 357155, Seattle, WA 98195-7155, USA. Fax +1 206 543 3389.