| Study | Reason for exclusion |
|---|---|
| Barry 1998 | Case series; no control group |
| Chang 2004 | Outcome measure not included in this review |
| van Vollenhoven 1992 | Case series; no control group |
| van Vollenhoven 1993 | Case series; no control group |
| van Vollenhoven 1994 | Case series; no control group |
| van Vollenhoven 1996 | Case series; no control group |
| van Vollenhoven 2001 | Study less than 3 months duration; placebo controlled trial |
| vanVollenhoven 1994b | Case series; no control group |
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