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. 2007 Nov;61(11):945–954. doi: 10.1136/jech.2006.054965

Box 1 Electronic databases searched (hosts given in parentheses).

ASSIA (CSA) ERIC (CSA/Dialog)
British Library catalogue Index to theses
Business Periodicals Premier Medline (Ovid/Dialog)
Conference Papers Index (CSA) NTIS (free version)
COPAC Psycinfo (Dialog/Ovid)
Econlit (Dialog/Ovid) Social Sciences Citation Index (MIMAS)
Electronic Collections Online (OCLC firstsearch) Sociological abstracts (CSA)
Embase (Dialog) Zetoc
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