[1] Natl Inst Res Cantacuzino, Natl Influenza Ctr, Lab Viral Resp Infect, Splaiul Independentei 103,Sect 5, Bucharest, Romania
[2] Horia Hulubei Natl Inst R&D Phys & Nucl Engn, Dept Computat Phys & Informat Technol, Str Reactorului 30,POB MG-6, Bucharest, Magurele, Romania
[3] Natl Inst Publ Hlth, Str Dr Leonte Anastasievici 1-3,Sect 5, Bucharest, Romania
[4] Univ Med & Pharm Carol Davila, Blvd Eroii Sanitari 8, Bucharest, Romania