doi: 10.1007/s00432-021-03668-6. Online ahead of print. 1 Department of Hematology, Tokushima Prefectural Central Hospital, 1-10-3 Kuramoto, Tokushima, 770-8539, Japan. email@example.com. 2 Department of Hematology, Gunma University Graduate School of Medicine, Gunma, Japan. 3 Infection Control and Prevention Center, Gunma University Hospital, Gunma, Japan. 4 Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Gunma, Japan.