Table 4.

Risk assessment of Cochrance bias.

Included studies	Random method	Allocation concealment	Therapeutic blindness	Outcome blind method	Data integrity	Selective publication	Others
Megna et al. (37)	Random	Unclear	Unclear	Unclear	Complete	Unclear	No
Santamato et al. (38)	Digital Photo Professional	Unclear	Unclear	Blind method	Complete	Unclear	No
Lu (41)	Numerical random table method	Unclear	Unclear	Unclear	Complete	Unclear	No
Liang et al. (40)	Numerical random table method	Unclear	Unclear	Unclear	Complete	Unclear	No
Duan et al. (39)	Numerical random table method	Centralized control	Single-blind	Unclear	Complete	Unclear	No
Wang et al. (42)	Numerical random table method	Centralized control	Single-blind	Blind method	One case was lost to follow-up	Unclear	No