Respiratory obstruction in children in Nigeria.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D005547:Foreign Bodies; D006801:Humans; D007223:Infant; D008297:Male; D009549:Nigeria; D012137:Respiratory System; D015619:Respiratory System Abnormalities; D012140:Respiratory Tract Diseases / Q000453:epidemiology; D012141:Respiratory Tract Infections; D012142:Respiratory Tract Neoplasms