Impaired bone marrow hematopoietic progenitor cell function in rheumatoid arthritis patients candidated to autologous hematopoietic stem cell transplantation. - Caporali, R.; Epis, O.; Ramaioli, I.; Invernizzi, R.; Rovati, B.; Comolli, G.; Danova, M.; Montecucco, C.; Porta, C. (Bone Marrow Transplantation, 2004)