*Articles were excluded for the following reasons: did not address screening (n = 10), did not address outcomes of interest (n = 5), or did not meet inclusion criteria for study type (n = 1).
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![Flow chart showing study flow: 1. Articles identified by initial literature review ( n = 452); 2. Excluded on the basis of title or abstract review ( n = 434); 3. Complete article reviewed ( n = 18); 4. Excluded on the basis of complete article review ( n = 16)*; 5. Articles abstracted ( n = 2); 6. Excluded after abstraction for not meeting inclusion criteria ( n = 1) (Clark, et al., 2002 [13]); 7. Included in systematic review ( n = 1) (Ostergaard, et al., 2000 [12]).](chlupfig1.gif)