Variations in clinical presentation, frequency of hemophagocytosis and clinical behavior of intravascular lymphoma diagnosed in different geographical regions oleh Andrés J.M. Ferreri, Giuseppina P. Dognini, Elías Campo, Rein Willemze, John F. Seymour, Osnat Bairey, Maurizio Martelli, Amalia De Renzo, Claudio Doglioni, Carlos Montalbán, Alberto Tedeschi, Astrid Pavlovsky, Sue Morgan, Lilj Uziel, Massimo Ferracci, Stefano Ascani, Umberto Gianelli, Carlo Patriarca, Fabio Facchetti, Alessio Dalla Libera, Barbara Pertoldi, Barbara Horváth, Arpad Szomor, Emanuele Zucca, Franco Cavalli, Maurilio Ponzoni, on behalf of the International Extranodal Lymphoma Study Group (IELSG)