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Seroprotection rates at pre-vaccination and post-vaccination 1, 3, and 6 months in the chemotherapy, hematopoietic stem cell transplantation, and control groups. Abbreviations: Chemo, chemotherapy; HSCT, hematopoietic stem cell transplantation; pre, pre-vaccination; M, months. Statistical significance was defined as * p < 0.05; ** p < 0.01; *** p < 0.001; **** p < 0.0001.
