Table 2: Characteristics of included studies (reasons for inclusion).

StudyReason for inclusion

Nishida et al. [39]The study design, intervention, and participants age were within the study criteria for inclusion
Uchida et al. [40]The study design, intervention, and participants age were within the study criteria for inclusion
Wallace and Bissada [41]The study design, intervention, and participants age were within the study criteria for inclusion
Fischer et al. [9]The study design, intervention, and participants age were within the study criteria for inclusion
Grant et al. [42]The study design, intervention, and participants age were within the study criteria for inclusion
Wang et al. [43]The study design, intervention, and participants age were within the study criteria for inclusion
Pihlstrom et al. [44]The study design, intervention, and participants age were within the study criteria for inclusion
Tammaro et al. [12]The study design, intervention, and participants age were within the study criteria for inclusion
Xu and Yang [45]The study design, intervention, and participants age were within the study criteria for inclusion
Vaitkevičienė et al. [15]The study design, intervention, and participants age were within the study criteria for inclusion
C. F. Canakçi and V. Canakçi [46]The study design, intervention, and participants age were within the study criteria for inclusion
Gong et al. [47]The study design, intervention, and participants age were within the study criteria for inclusion