1. Department of Haematology and Stem Cell Transplantation Unit; IRCCS ‘Casa Sollievo della Sofferenza’ Hospital; San Giovanni Rotondo; Italy
2. Department of Haematology and Laboratory; Hospital de la Santa Creu I Sant Pau; Barcelona; Spain
3. Unit of Biostatistics; IRCCS ‘Casa Sollievo della Sofferenza'Hospital; San Giovanni Rotondo; Italy