1. Central Hospital S, Maurizio; Department of Haematology and Bone Marrow Transplantation; Bolzano Italy 39100
2. Spedali Civili di Brescia; Haematology Department; Brescia Italy 25100
3. Queen's University Belfast; Centre for Public Health; Institute of Clinical Sciences, Block B, Royal Victoria Hospital Grosvenor Road Belfast Northern Ireland UK BT12 6BJ