A cross-sectional seroepidemiology study of seven major enteroviruses causing HFMD in Guangdong, China. Issue 1 (July 2021) - Gao, Fan; Bian, Lian-lian; Chen, Lei; Zhou, Yan-ping; Li, Gui-fan; Mao, Qun-ying; He, Qian; Wu, Xing; Yao, Shan-shan; Yang, Xiao-ming; Liang, Zheng-lun