[1] US CDCP, Div Viral Hepatitis, 1600 Clifton Rd NE, Atlanta, GA 30329 USA
[2] Hepatitis B Fdn, Cooperman Barnabas Med Ctr, Livingston, NJ USA
[3] WHO, Collaborating Ctr Viral Hepatitis, Peter Doherty Inst Infect & Immun, Melbourne, Vic, Australia
[4] Robert Koch Inst, Dept Infect Dis Epidemiol, Berlin, Germany