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 We report two cases of sudden deafness which appeared during vaso - occlusive crisis of a sickle cell anaemia ( homozygous form of disease ) and a sickle cell trait ( heterozygous form ) in two males aged sixteen and twenty - two , respectively . A high erythrocyte aggregability and low deformability were proved in both young men . Although hearing disorders have been reported in this disease , a sudden onset is not common . The treatment used was useful in the removal of painful crisis and infections , but deafness did not improve in either of then .
sudden deafness
hearing disorders
deafness