Studies | Selection | Comparability | Outcome | Score | Overall quality |
Kim 2020 | 1 | 2 | 1 | 4 | Low |
KUZUYA 2020 | 2 | 3 | 2 | 7 | Middle |
Nakano 2020 | 3 | 3 | 2 | 8 | High |
Tomonari 2020 | 3 | 3 | 2 | 8 | High |