1 Divisions of Haematopathology, Haematology Programme, European Institute of Oncology IRCCS, Via Ripamonti 435, 20141 Milan (Italy). stefano.pileri@ieo.it.
2 Divisions of Haematopathology, Haematology Programme, European Institute of Oncology IRCCS, Via Ripamonti 435, 20141 Milan (Italy).
3 Divisions of Haemato-oncology, Haematology Programme, European Institute of Oncology IRCCS, Via Ripamonti 435, 20141 Milan (Italy).