About: http://webisa.webdatacommons.org/222986544

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Factors such as infection in the upper respiratory tract (a cold) or mucosal hypertrophy can prevent the Eustachian tube from opening; this causes a lack of air to the middle ear, which produces a suction effect on the eardrum.
http://www.w3.org/ns/prov#wasQuotedFrom	lobe.ca