1. Carol Davila University of Medicine and Pharmacy , Bucharest , Romania
2. Fundeni Clinical Institute , Department of Kidney Transplantation , Bucharest , Romania
3. Fundeni Clinical Institute , Department of Nephrology , Bucharest Romania
4. Victor Babeș Clinical Hospital for Infectious and Tropical Diseases , Bucharest , Romania
5. Fundeni Clinical Institute , Centre of Immunogenetics and Virology , Bucharest , Romania
6. Fundeni Clinical Institute , Department 2 of Intensive Care Unit , Bucharest , Romania