Newcastle-Ottawa assessment scale of cohort studies within the top 25 most-cited articles ordered by citation ranking.
| Study | Representative of Cohorts | Selection of Nonexposed Cohort | Ascertainment of Exposure | Outcome of Interest Absent at Start of Study | Cohort Comparability | Outcome Assessment | Sufficient Follow-up | Adequacy of Follow-up | Total Score |
| 1. Kantelhardt et al (2011)10 | * | * | * | * | * | * | * | * | 8 |
| 3. Hyun et al (2017)12 | * | * | * | * | ** | * | * | * | 9 |
| 4. Schatlo et al (2014)13 | * | * | * | * | ** | * | * | * | 9 |
| 5. Kim et al (2017)14 | * | * | * | * | ** | * | * | * | 9 |
| 8. Lonjon et al (2016)4 | * | * | * | * | * * | * | * | * | 9 |
| 10. Lieberman et al (2012)18 | - | - | * | - | - | * | * | * | 4 |
| 15. Kim et al (2015)22 | * | * | * | * | - | * | * | * | 7 |
| 18. Le et al (2018)6 | - | - | * | * | * | * | * | * | 6 |
| 19. Urakov et al (2017)25 | - | - | - | - | - | - | - | - | 0 |
| 21. Schröder et al (2017)27 | - | - | - | - | - | - | - | - | 0 |
| 22. Fan et al (2017)28 | * | * | * | * | - | * | * | * | 7 |