Corrigendum to: Computational design of ultrashort peptide inhibitors of the receptor-binding domain of the SARS-CoV-2 S protein. Issue 6 (17th July 2021) - Pei, Pengfei; Qin, Hongbo; Chen, Jialin; Wang, Fengli; He, Chengzhi; He, Shiting; Hong, Bixia; Liu, Ke; Qiao, Renzhong; Fan, Huahao; Tong, Yigang; Chen, Long; et al.