COVID‐19 in an adolescent with aplastic anemia undergoing immunosuppressive therapy: A case report and details of antibody testing for SARS‐CoV‐2. Issue 2 (5th September 2021) - Kato, Shota; Nakano, Yoshiko; Nakano, Yuki; Okamoto, Koh; Takasugi, Nao; Hidaka, Moe; Sekiguchi, Masahiro; Hiwatari, Mitsuteru; Kurano, Makoto; Kato, Motohiro