Bob Löwenberg1, Marie José Kersten2, Robert Peter Gale3, Marinus van Oers2. 1. Erasmus University Medical Center Rotterdam and ErasmusMC Cancer Institute Rotterdam, Rotterdam, The Netherlands. 2. Department of Hematology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands. 3. Haematology Research Centre, Department of Immunology and Inflammation, Imperial College London, London, UK. robertpetergale@alumni.ucla.edu.