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This item has the following additional materials available:

Table 1: Summary of randomized controlled trials
Table 2: Clinical data reported from the trials
Table 3: Quality of reporting, by CONSORT criteria

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Copyright 1995-2010, Canadian Medical Association. All rights reserved. ISSN 1488-2329 (e) 0820-3946 (p) All editorial matter in CMAJ represents the opinions of the authors and not necessarily those of the Canadian Medical Association.