A population-based prevalence study of hepatitis A, B and C virus using oral fluid in Flanders, Belgium., Quoilin, Sophie, Hutse Veronik, Vandenberghe Hans, Claeys Françoise, Verhaegen Els, De Cock Liesbet, Van Loock Frank, Top Geert, Van Damme Pierre, Vranckx Robert, et al. , Eur J Epidemiol, 2007, Volume 22, Issue 3, p.195-202, (2007)