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纳入研究的质量评价
Quality evaluation of included trials
| Trials | Randomization | Allocation concealment | Blindness | Follow up | ITT analysis | Baseline | Quality grading |
| Johnson 2004[3] | Computerized | Unclear | No | Yes | Yes | Yes | C |
| Sandler 2006[4] | Stratified | Unclear | Unclear | Yes | Yes | Yes | B |
| Herbst 2007[5] | Stratified | Unclear | Unclear | Yes | Yes | Yes | B |
| Reck 2010[6] | Stratified | Yes | Double-blind | Yes | Yes | Yes | A |
| Soria 2011[7] | Unclear | Unclear | No | Yes | Yes | Yes | C |
| Niho 2012[8] | Stratified | Unclear | Unclear | Yes | Yes | Yes | B |
