Ambulatory Visits for Otitis Media before and after the Introduction of Pneumococcal Conjugate Vaccination

To examine the long-term trend of otitis media (OM)-associated ambulatory visits from 1997 to 2014 and to evaluate the impact of 7-valent and 13-valent pneumococcal conjugate vaccines (PCV7 and PCV13) on OM ambulatory visits.

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