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childhood diseases, such as measles and whooping cough (Hethcote & Levin 1989; Earn et al. 2000; May 2000; Grenfell et alOne key test of these models has been their ability to explain the observed transition fro
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Document Date: 2009-01-17 11:32:19
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childhood diseases, such as measles and whooping cough (Hethcote & Levin 1989; Earn et al. 2000; May 2000; Grenfell et alOne key test of these models has been their ability to explain the observed transition fro