You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Abstract Background The tympanic membrane perforation is generally caused by infection or trauma . It is a condition that can cause hearing loss ; its incidence varies between 1 and 3% of the population in the United States , and even less than 1% in the world population . Objective This study is to conduct a pilot test in which the effectiveness of conservative treatment was measured and compared by applying phenytoin or platelet - rich plasma to close tympanic perforations and the healing period of the same . Patients and methods Ten patients were included and all of them fulfilled the selection criteria : Age over five years - old , indiscriminate sex with a diagnosis of perforated eardrum , eardrum perforation between 30 and 60% and presence of tympanic remnant ; and no previous surgical treatment . Elimination criteria were those patients with marginal eardrum perforations , patients who were not on antiplatelet drugs or anticoagulants , poor response to platelet - rich plasma after 6 weeks , patients with known autoimmune , active neoplastic , atopic otic conditions and those currently under immunosuppressive treatments . Participants were randomized into two groups according to treatment : phenytoin ( 0 .2 mg ) or platelet - rich plasma ( 0 .2–0 .5 cc ) . Results Ten patients with unilateral tympanic perforation were recorded whose average age was 26 .9 ± 14 .9 years ; the sex distribution was 1 .5 : 1 male predominance . In treatment A , the average closing time was 3 .8 ± 0 .836 weeks ; meanwhile , in the treatment B the closure time was 5 .2 ± 0 .836 weeks .
hearing loss