Table 3.

Quality assessment of randomized controlled trials

Study, year [ref.]	Generation of random sequences	Allocation concealment	Blind method	Withdrawal	Total
Wei Fu, 2019 [22]	2	1	0	1	4
Jianguo Yang, 2018 [23]	2	1	0	1	4
Xianghua Lin, 2016 [24]	0	0	0	1	1