Comment on: Pneumocystis jirovecii pneumonia: still a concern in patients with haematological malignancies and stem cell transplant recipients. (12th January 2017) - Antinori, Spinello; Binda, Francesca; van den Bogaart, Lorena; Rech, Roberto; Castelli, Antonio; Galli, Massimo; Milazzo, Laura; Corbellino, Mario; Ridolfo, Anna Lisa