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Monatsschrift Kinderheilkunde > 2011 > 159 > 12 > 1228-1233
International Journal of Pediatric Otorhinolaryngology > 2008 > 72 > 12 > 1885-1888
International Journal of Pediatric Otorhinolaryngology Extra > 2007 > 2 > 3 > 147-150
International Journal of Pediatric Otorhinolaryngology > 1995 > 33 > 2 > 149-157