| Study | Reason for exclusion |
| AbuRahma 1994 | Not RCT (included in 2002 review) |
| Greipp 1990 | Not RCT (included in 2002 review) |
| Haynsworth 1991 | Not double blind (included in 2002 review) |
| Mailis 1994 | Not RCT (included in 2002 review) |
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