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Extracorporeal Photopheresis for Steroid Resistant Graft Versus Host Disease in Pediatric PatientsMassimo, Berger; Rosanna, Pessolano; Roberto, Albiani; Sebastian, Asaftei; Veronica, Barat; Francesca, Carraro; Eleonora, Biasin; Enrico, Madon; Franca, Fagioli · Journal of Pediatric Hematology/Oncology · 2007