Sonja Zweegman1, Alessandra Larocca2. 1. Department of Haematology, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Center Amsterdam, Amsterdam, Netherlands. Electronic address: s.zweegman@vumc.nl. 2. Myeloma Unit, Division of Hematology, University of Torino, Azienda Ospedaliero-Universitaria Città della Salute e della Scienza di Torino, Torino, Italy.