["Collar studs"].
D002648:Child; D002908:Chronic Disease; D004322:Drainage / Q000295:instrumentation*; D005064:Eustachian Tube / Q000503:physiopathology; D006801:Humans; D010033:Otitis Media / Q000628:therapy*; D010034:Otitis Media with Effusion / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy*; D014432:Tympanic Membrane
"Boordeknoopjes".