Table 3.
Risk of bias assessment.
| Study | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Total |
|---|---|---|---|---|---|---|---|---|---|
| Berta | A | A | A | A | A | B | A | A | 8 |
| Lee | A | A | A | B | A | B | A | A | 7 |
| Fernando | A | A | A | B | A | B | A | A | 7 |
| Beatriz | A | A | A | A | A | B | A | A | 8 |
| Markus | A | A | A | B | A | B | A | A | 7 |
| Christoph | A | A | A | A | A | B | A | B | 8 |
| Ralph | A | A | A | A | A | B | A | B | 8 |
| Daniel | A | A | A | B | A | B | A | A | 7 |
| Robert | A | A | A | B | A | B | A | A | 7 |
| Negar | A | A | A | B | A | B | A | A | 7 |
| Jose | A | A | A | B | A | B | A | A | 7 |
| Heng | A | A | A | B | A | B | A | A | 7 |
| Fernando | A | A | A | B | A | B | A | A | 7 |
| Mohammad | A | A | A | B | A | B | A | A | 7 |
| Cheol | A | A | A | A | A | B | A | A | 8 |
| Yan | A | A | A | B | A | B | A | A | 7 |
| Kensaku | A | A | A | A | A | B | A | A | 8 |
| Alexandre | A | A | A | B | A | B | A | C | 6 |
| Gert | A | A | A | B | A | B | A | B | 7 |
1: representativeness of the exposed cohort; 2: selection of the nonexposed cohort; 3: ascertainment of exposure; 4: outcome of interest was not present at the beginning of study; 5: comparability of cohorts; 6: assessment of outcome; 7: long enough follow-up; 8: adequacy of follow-up; A: 1 score; B: 0/1 score; C: 0 score.