Erratum to: Human Herpesvirus 6 Reactivation Evaluated by Digital Polymerase Chain Reaction and Its Association With Dynamics of CD134-Positive T Cells After Allogeneic Hematopoietic Stem Cell Transplantation. (31st December 2019) - Nakayama, Hitomi; Yamazaki, Rie; Kato, Jun; Koda, Yuya; Sakurai, Masatoshi; Abe, Ryohei; Watanuki, Shintaro; Sumiya, Chieko; Shiroshita, Kohei; Fujita, Shinya; Yamaguchi, Kentaro; Okamoto, Shinichiro; et al.