References | 1. A clearly stated aim | 2. Inclusion of consecutive patients | 3. Prospective collection of data | 4. Endpoints appropriate to the aim of the study | 5. Unbiased assessment of the study endpoint | 6. Follow-up period appropriate to the aim of the study | 7. Loss to follow up less than 5% | 8. Prospective calculation of the study size | 9. An adequate control group | 10. Contemporary groups | 11. Baseline equivalence of groups | 12. Adequate statistical analyses | Total |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Boysen et al. [39] | 2 | 1 | 2 | 2 | 0 | 2 | 0 | 0 | 2 | 2 | 2 | 2 | 17/24 |
Brin et al. [40] | 2 | 2 | 2 | 2 | 0 | 2 | 1 | 0 | 1 | 1 | 2 | 2 | 17/24 |
Bjerklin et al. [41] | 2 | 2 | 1 | 2 | 0 | 2 | 2 | 0 | 2 | 2 | 2 | 2 | 19/24 |