1 Department of Molecular Medicine, University of Pavia, Pavia, Italy.
2 Division of Hematology, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo, Pavia, Italy.
3 Service of Clinical Epidemiology and Biostatistics, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo, Pavia, Italy.