Text this: Advances in comprehensive management and nursing of chronic graft-versus-host disease under the background of interferon-α therapy in the prevention of relapsed patients with acute myeloid leukemia after allogeneic hematopoietic stem cell transplantation (干扰素-α预防急性髓系白血病患者移植后复发背景下慢性移植物抗宿主病的综合管理与护理进展)