TY - Front. Med. A1 - Guangbiao Zhou, Saijuan Chen, Zhu Chen T1 - Back to the spring of 2020: facts and hope of COVID-19 outbreak Y1 - 2020-04-15 JF - Frontiers of Medicine JO - Front. Med. SP - 113 EP - 116 VL - 14 IS - 2 UR - https://journal.hep.com.cn/fmd N1 - 10.1007/s11684-020-0758-9 ER -