[1] Penn State Univ, Milton S Hershey Med Ctr, Dept Pathol, 500 Univ Dr, Hershey, PA 17033 USA
[2] Sera & Vaccine Lab, Warsaw, Poland
[3] Med Acad Latvia, Childrens Hosp, Riga, Latvia
[4] Univ Zagreb, Hosp Infect Dis, Zagreb 41000, Croatia
[5] Case Western Reserve Univ, Cleveland, OH 44106 USA
[6] Univ Ljubljana, Ljubljana, Slovenia
[7] Kaunas Med Univ Hosp, Kaunas, Lithuania
[8] Inst Cantacuzino, Bucharest, Romania
[9] Acad Med Sofia, Hosp Infect Dis, Sofia, Bulgaria
[10] Natl Ctr Epidemiol, Budapest, Hungary
[11] St Cyril & Method Hosp, Bratislava, Slovakia
[12] Natl Canc Inst, Bratislava, Slovakia
[13] Natl Antibiot Reference Lab, Prague, Czech Republic