Case series‡ Elster, 40 2009 Miller and Miller 42 2009 Stewart, 44 2012 Miller and Benfield, 43 2008 Wiberg and Wiberg, 45 2010 Davies and Jamison, 39 2007 Marchand and Miller, 41 2009
 1. Question clearly stated?YesYesNoYesYesYesYes
 2. Population clearly described?NoYesNoYesYesYesCD
 3. Were cases consecutive?CDYesCDYesYesYesCD
 4. Were subjects comparable?CDYesCDYesYesYesCD
 5. Intervention clearly described?NoNoNoNoNoYesNo
 6. Outcomes consistent and appropriate across all participants?NoNoNoNoNoNoNo
 7. Follow-up adequate?CDCDNoCDNoCDCD
 8. Statistics described and appropriate?NoNAYesYesCDNANA
 9. Results clear?NoYesNoYesNoNoNo
Quality assessment Low Mod Low Mod Mod Mod Low