Guest Editorial Computational Social Systems for COVID-19 Emergency Management and Beyond. - Jun Jason Zhang; Fei-Yue Wang 001; Yong Yuan; Guandong Xu; Huan Liu 001; Wei Gao 001; Shoaib Jameel; Imran Razzak; Peter W. Eklund; Sheraz Ahmed; Rui Qin 002; Juanjuan Li; et al. (IEEE Trans. Comput. Soc. Syst., 2021)