Hematology Division, Harvard Medical School; Massachusetts General Hospital, Boston, Massachusetts, USA.
Internal Medicine Clinic & Department of Research, Østfold Hospital, Norway; Institute of Clinical Medicine, University of Oslo, Norway.
Hematology Department, Hospital Universitario 12 de Octubre, Madrid, Spain.
Clinic of Hematology, University Clinical Center of Serbia, Belgrade, Serbia; Medical Faculty, University of Belgrade, Belgrade, Serbia.