[1] Univ Amsterdam, Acad Med Ctr, HIV Monitoring Fdn, NL-1105 AZ Amsterdam, Netherlands
[2] Univ London Imperial Coll Sci Technol & Med, Dept Infect Dis Epidemiol, London, England
[3] Univ Amsterdam, Acad Med Ctr, Dept Med Microbiol, Lab Expt Virol,CINIMA, NL-1105 AZ Amsterdam, Netherlands
[4] Univ Amsterdam, Acad Med Ctr, Dept Internal Med, NL-1105 AZ Amsterdam, Netherlands
[5] Hlth Serv Amsterdam, Dept Infect Dis, Amsterdam, Netherlands
[6] Natl Inst Publ Hlth & Environm, Ctr Infect Dis Control, Bilthoven, Netherlands