[1] TEL AVIV UNIV,SACKLER FAC MED,DEPT PREVENT & SOCIAL MED,IL-69978 TEL AVIV,ISRAEL
[2] RAMBAM GOVT HOSP,DEPT MICROBIOL,HAIFA,ISRAEL
[3] ABA HUSHI SCH MED,HAIFA,ISRAEL
[4] ACRE HLTH OFF,ACRE,ISRAEL
[5] HEBREW UNIV JERUSALEM,HADASSAH MED SCH,DEPT VIROL,IL-91010 JERUSALEM,ISRAEL