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| Author | Cascinu 1995 | Cunningham 1998 | Glimelius 1997 | Scheithauer 1993 |
| Quality assessment | ||||
| Described as randomised? Y / N | 1 | 1 | 1 | 1 |
| Described as double blind? Y/ N | 0 | 0 | 0 | 0 |
| Withdrawals and dropouts described Y/N | 1 | 1 | 1 | 1 |
| Appropriate randomisation method? Y / N | 1 | 1 | 0 | 1 |
| Appropriate method of blinding? | 0 | 0 | 0 | 0 |
| TOTAL SCORE | 3 | 3 | 2 | 3 |
