Distinct kinetics of immunoglobulin isotypes reveal early diagnosis and disease severity of COVID‐19: A 6‐month follow‐up. Issue 3 (24th March 2021) - Yu, Siyang; An, Jianghong; Liao, Xuejiao; Wang, Haiyan; Ma, Fen; Li, Dapeng; Li, Aimin; Liu, Weilong; Zhang, Siwei; Liao, Mingfeng; Liu, Lei; Zhao, Juanjuan; et al.