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:

Vitamin B12 deficiency is common in the elderly ; its subtle clinical manifestations are very rarely recognized . We present the case of a male patient , 81 years old , with cognitive impairment due to drug - related vitamin B12 deficiency and possible chronic gastritis . It is important to remember the most relevant causes of cobalamin deficiency in the clinical practice , the nervous system damage , and the cognitive domain impairments that occur with the mentioned damage . It is necessary to make an early diagnosis and to institute prompt treatment ; in practice the usual treatment is intramuscular , although several studies have shown the effectiveness of the oral treatment .
cognitive impairment
cognitive domain impairments