Are we hitting immunity targets? The 2006 age-specific seroprevalence of measles, mumps, rubella, diphtheria and tetanus in Belgium36577, Theeten, Heidi, Hutse Veronik, Hens N., Yavuz Y., Hoppenbrouwers K., Beutels Philippe, Vranckx R., and Van Damme P. , Epidemiol.Infect., 0/4/2011, Volume 139, Issue 4, Number 504, p.494 - 504, (2011)