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Purpose of the Study.........................................................................................................6 Method ..............................................................................................................................7 Search and Selection Criteria ..................................................................................7 Procedure ................................................................................................................8 Results .............................................................................................................................10 Description of Studies in Review .........................................................................10 Overall Results ......................................................................................................11 Discussion.......................................................................................................................13 Research Quality Issues ........................................................................................13 Limitations of the Present Study...........................................................................13 Conclusions .....................................................................................................................15 References .......................................................................................................................16 Appendix: Information Coded for Each Study...............................................................24
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