Evaluation of prognostic factors among patients with chronic graft-versus-host disease oleh Jose A. Pérez-Simón, Gabriel Afram, Rodrigo Martino, Jose L Piñana, Teresa Caballero-Velazquez, Olle Ringden, David Valcarcel, Dolores Caballero, Mats Remberger, Yanira de Paz, Jordi Sierra, Jesús San Miguel, Hans Hagglund