[1] Univ Ghent, HIV Translat Res Unit, Dept Internal Med, Fac Med & Hlth Sci, B-9000 Ghent, Belgium
[2] Ghent Univ Hosp, Ghent, Belgium
[3] Royal Free Hosp, Div Infect & Immun, London NW3 2QG, England
[4] Univ Ghent, AIDS Reference Lab, Dept Clin Chem Microbiol & Immunol, B-9000 Ghent, Belgium
[5] Ghent Univ Hosp, Dept Gastroenterol, Ghent, Belgium
[6] Royal Free Hosp, Dept Gastroenterol, London NW3 2QG, England