title: Preliterate environment and the nasopharynx.
mesh_terms: D000234:Adenoids / Q000033:anatomy & histology; D000328:Adult; D000349:Africa; D044383:Black People; D002508:Cephalometry; D001270:Cervical Atlas / Q000033:anatomy & histology; D004777:Environment; D005260:Female; D006801:Humans; D007199:Indians, South American; D008297:Male; D008875:Middle Aged; D009295:Nasal Bone / Q000033:anatomy & histology; D009305:Nasopharynx / Q000033:anatomy & histology*; D010239:Paraguay