<style face="normal" font="default" size="100%">Effect of antibiotics for otitis media on mastoiditis in children: a retrospective cohort study using the United kingdom general practice research database</style>

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31<style face="normal" font="default" size="100%">Effect of antibiotics for otitis media on mastoiditis in children: a retrospective cohort study using the United kingdom general practice research database</style><style face="normal" font="default" size="100%">Effect of antibiotics for otitis media on mastoiditis in children: a retrospective cohort study using the United kingdom general practice research database</style>