1. Arenz S, Kalies H, Ludwig S et al. (2004) Der Masernausbruch in Coburg: Was läßt sich daraus lernen? Dtsch Ärztebl 49:3245–3249
2. CDC (2004) National, state and urban area vaccination coverage among children aged 19–35 months — United States, 2003. MMWR Morb Mortal Wkly Rep 53:658–661
3. CDC (2003) National, state and urban area vaccination coverage among children aged 19–35 months—United States, 2002. MMWR Morb Mortal Wkly Rep 52:728–732
4. Cox D, Oaekes D (1984) Analysis of survival data. Chapman & Hall, New York
5. Crowcroft NS, Stein C, Duclos P et al. (2003) How best to estimate the global burden of pertussis? Lancet Infect Dis 3:413–418