1. National Center of Hematology; Sofia; Bulgaria
2. Department of Hematology and Oncology; Medical University; Warsaw; Poland
3. Department of Hematology and Internal Medicine; J. Strus Hospital; Poznan; Poland
4. Department of Hematology; Sveta Marina University Hospital; Varna; Bulgaria
5. Department of Hematology; University Hospital; Medical University; Pleven; Bulgaria
6. Department of Hemostasis and Thrombosis; La Fe University Hospital; Valencia; Spain
7. Department of Clinical Trials and Pharmacovigilance; Instituto Grifols S.A.; Parets del Vallès; Barcelona; Spain