1. Bing Center for Waldenström Macroglobulinemia; Dana-Farber Cancer Institute; Boston MA USA
2. Department of Internal Medicine/Haematology; St. Antonius Hospital; Nieuwegein the Netherlands
3. Department of Pathology; Brigham and Women's Hospital; Boston MA USA
4. Harvard Medical School; Boston MA USA
5. Department of Haematology; Academic Medical Centre; Amsterdam the Netherlands
6. Department of Haematology; UMC Utrecht Cancer Centre; Utrecht the Netherlands