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| Study | Randomization | Double‐blinding | Dropout/Withdrawls | TotalScore |
| Barth | 1 | 0 | 0 | 1 |
| Beets | 2 | 2 | 0 | 4 |
| Butters | 2 | 1 | 1 | 3 |
| Danielsson | 1 | 0 | 1 | 2 |
| Hay | 2 | 1 | 0 | 3 |
| Hetzer | 0 | 0 | 1 | 1 |
| Kingsnorth | 2 | 1 | 0 | 3 |
| Kovacs | 0 | 1 | 1 | 2 |
| Kux | 0 | 1 | 1 | 2 |
| McGillicuddy | 0 | 0 | 1 | 1 |
| Miedema | 2 | 1 | 1 | 4 |
| Nordin | 1 | 2 | 0 | 3 |
| Paul | 1 | 1 | 0 | 2 |
| Thapar | 1 | 0 | 1 | 2 |
| Tran | 1 | 0 | 0 | 1 |
| Zieren | 1 | 1 | 1 | 3 |
