We searched the following electronic databases, trial registers, and websites the Cochrane Gynaecology and Fertility Group CGF Specialised Register of controlled trials, the Cochrane Central Register of of Controlled Trials, via the Cochrane Register of Studies Online CRSO, MEDLINE, Embase, PsycINFO, the Cumulative Index to Nursing and Allied Health Literature CINAHL, Web of Knowledge, the Open System for Information on Grey Literature in Europe OpenSIGLE, the Latin American and Caribbean Health Science Information Database LILACS, clinical trial registries, and the reference lists of relevant articles <a href=
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