1. Department of Medicine, Clinicum, University of Helsinki, and Helsinki University Central Hospital, Helsinki, Finland
2. Department of Orthopaedic Surgery, Yamagata University, Yamagata, Japan
3. Hematology and Cancer Center, Helsinki University Central Hospital, Helsinki, Finland
4. Department of Pathology, University of Helsinki, Helsinki, Finland
5. Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
6. Department of Internal Medicine and Rehabilitation, Helsinki University Central Hospital, and University of Helsinki, Helsinki, Finland