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:

  SUMMARY While still most patients with hearing loss continue to benefit from conventional hearing aids , implantable hearing devices have rapidly evolved existing in the present a great variety of them . Cochlear implants remain the most used and in which there is greater experience . Implantable or semi Implantable bone conduction prosthesis changed the management of outer and middle ear atresia and malformations . Despite how promising present and future is visualized with the use of these devices , we should always keep in mind that they require a surgical procedure for implantation and are not exent of complications , which should make us judiciously choose the prosthesis to be use .
hearing loss