1. Department of General Surgery Gulhane Traning and Research Hospital Health Science University Ankara Turkey
2. Regional Blood Center Gulhane Traning and Research Hospital Health Science University Ankara Turkey
3. Department of Pediatrics Faculty of Medicine Hacettepe University Ankara Turkey
4. Department of Blood and Transfusion Center Faculty of Medicine Hacettepe University Ankara Turkey
5. Department of General Surgery Faculty of Medicine Hacettepe University Ankara Turkey
6. Department of Anesthesiology and Reanimation Faculty of Medicine Hacettepe University Ankara Turkey
7. Department of Blood and Transfusion Center Diskapi Yildirim Beyazit Traning and Research Hospital Health Science University Ankara Turkey
8. Department of General Surgery Diskapi Yildirim Beyazit Traning and Research Hospital Health Science University Ankara Turkey
9. Department of Blood and Transfusion Center Faculty of Medicine Gazi University Ankara Turkey
10. Department of Blood and Transfusion Center Faculty of Medicine Ankara University Ankara Turkey
11. Department of General Medicine Kecioren Traning and Research Hospital Health Science University Ankara Turkey