1. Department of Hematology; Roskilde University Hospital; Denmark
2. The Research Unit for General Practice and Section of General Practice; Department of Public Health; University of Copenhagen; Denmark
3. Department of Rheumatology; Odense University Hospital; Denmark
4. Department of Hematology; Odense University Hospital; Denmark
5. Copenhagen General Practitioners' Laboratory; Copenhagen Denmark
6. Department of Hematology; Copenhagen University Hospital; Denmark