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Background
Chronic graft‐versus‐host disease is a severe complication of allogeneic stem cell and bone marrow transplantation. First‐line immunosuppressive agents, such as steroids, are used to prevent this disease; however, they have multiple side effects. Therefore, bath psoralen plus ultraviolet‐A (PUVA) is an alternative second‐line treatment. This study aimed to evaluate the clinical efficacy...