“…We identified 3,210 records through database searches and 64 studies were eventually included in the meta-analysis ( Chenliang, 2019 ; Dianzhen, 2013 ; Diwen et al., 2019 ; Enfang and Yan, 2017 ; Fuyingcong, 2012 ; Gang and Lijun, 2020 ; Hao, 2012 ; Haoyun et al., 2019 ; Hongyan et al., 2016 ; Hongyao, 2017 ; Houyuan, 2014 ; Huang et al., 2020 ; Huaqing and Zuomiao, 2011 ; Hui and Ning, 2008 ; Huimin et al., 2019 ; Jing and Yujian, 2017 ; Jingquan and Wenxiu, 2018 ; Lei et al., 2015 ; Li et al., 2013 , 2018 ; Lianhong et al., 2015 ; Limei and Congying, 2020 ; Lingyun, 2015 ; Liqun and Lin, 2020 ; Lu et al., 2016 ; Ma et al., 2020 ; Meng, 2016 ; Meng et al., 2018 ; Mengying et al., 2019 ; Miao et al., 2012 ; Mingke et al., 2011 ; Nengzhi et al., 2010 ; Pu et al., 2017 ; Qiuyu, 2020 ; Shanshan and Li, 2020 ; Sun et al., 2012 ; Suqiu, 2019 ; Tieshuang, 2010 ; Tingmei, 2016 ; Wang et al., 2012 , 2020a , 2020b , 2021 ; Weiye et al., 2018 ; Wen et al., 2016 ; Wencheng, 2011 ; Wenxuan et al., 2016 ; Xi et al., 2020 ; Xia et al., 2007 ; Xiao et al., 2014 ; Xiaojuan and Fuzhong, 2015 ; Xiaoyan et al., 2019 ; Xiuzhen et al., 2009 ; Yanli, 2012 ; Yanling et al., 2019a ...…”