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Data S1. Search strategies.

Box S1. Database: Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1990 to Present>.

Box S2. Database: Embase Classic+Embase <1990 to 2012 August 19>.

Box S3. Database: CINAHL via Ebsco.

Box S4. Database: ISI Web of Science: Science Citation Index, Conference Proceedings Citation.

Box S5. PRISMA Checklist.

Table S1. Key characteristics of included studies

Table S2. Quality scoring of studies.

Appendix S1: Reasons for excluding studies.

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