1 Department of Internal Medicine - Haematology, Maastricht University Medical Center, Maastricht, the Netherlands.
2 Department of Haematology, Cambridge University Hospitals NHS Foundation Trust, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK.
3 Department of Internal Medicine - Haematology, Maastricht University Medical Center, Maastricht, the Netherlands. Electronic address: [email protected].