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 Objective To know the etiology of preiperlingual bilateral hearing loss in children . Materials and methods All the patients diagnosed with bilateral severe/profound , pre or perilingual hearing loss at Sierrallana and Marqués de Valdecilla Hospitals ( Cantabria , Spain ) during the last 20 years were included in this study . Results A hundred patients were diagnosed with bilateral severe/profound pre/perilingual hearing loss . The most frequent etiology was hereditary ( 49% ) , followed by severe perinatal hypoxia ( 11% ) , ototoxicity ( 5% ) , meningitis ( 3% ) , hyperbilirubinemia ( 3% ) and rubella ( 2% ) . In 21% of cases was not Known . Conclusions The two most frequent etiologies found in severe/profound hearing loss in children in our area were hereditary and non infectious perinatal problems . Infectious disease were scarce . Will decrease when genetic test were used as clinical basis .
preiperlingual bilateral hearing loss
bilateral severe/profound , pre or perilingual hearing loss
bilateral severe/profound pre/perilingual hearing loss
severe/profound hearing loss