Table 4.

Results of the ROBIS assessments. Note: √: low risk; ×: high risk.

Author, year (country)	Phase 1	Phase 2				Phase 3
	Assessing relevance	Domain 1: study eligibility criteria	Domain 2: identification and selection of studies	Domain 3: collection and study appraisal	Domain 4: synthesis and findings	Risk of bias in the review
Mengyao Chao, 2018 (China) [33]	√	√	√	√	√	×
Myeong Soo Lee, 2015 (South Korea) [34]	√	√	√	×	×	√
Shuai Guo, 2021 (China) [35]	√	√	√	√	×	×
Ting-Wei Xia, 2019 (China) [36]	√	√	√	√	√	√
Zonglei Zhou, 2019 (China) [37]	√	√	√	√	×	×
Yao Ge, 2020 (China) [38]	√	√	×	×	×	×
Yongjin Liu, 2017 (China) [39]	√	√	×	√	√	×
Qing Tang, 2017 (China) [40]	√	√	×	×	×	×