1. Department of Haematology, Odense University Hospital, Odense, Denmark,
2. Department of Haematology, Lund University Hospital, Lund, Sweden,
3. Department of Haematology, Aarhus University Hospital, Århus, Denmark,
4. Department of Haematology, Rigshospitalet, Copenhagen, Denmark,
5. Department of Haematology, University Hospital MAS, Malmö, Sweden,
6. Department of Medicine, Sundsvall Hospital, Sundsvall, Sweden,
7. Ciba‐Geigy Ltd, Clinical Research, Basle, Switzerland