1. Department of Haematology; University Medical Centre Groningen; Groningen The Netherlands
2. Department of Research; Netherlands Comprehensive Cancer Organisation; Utrecht The Netherlands
3. Department of Haematology; Medical Centre Leeuwarden; Leeuwarden The Netherlands
4. Department of Haematology; Antonius Hospital; Sneek The Netherlands
5. Department of Haematology; Martini Hospital; Groningen The Netherlands
6. Department of Haematology; Röpcke-Zweers Hospital; Hardenberg The Netherlands
7. Department of Haematology; Nij Smellinghe Hospital; Drachten The Netherlands