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:

Introduction Alzheimer disease ( AD ) is a neurodegenerative disease characterised by progressive dementia associated with global cognitive dysfunction . Methods We conducted a systematic review and meta - analysis of clinical trials evaluating omega - 3 supplementation in patients with AD . Objective To determine if there is scientific evidence of the effectiveness of omega - 3 supplementation in improving cognitive function in patients with AD . Search strategy We included only randomised controlled trials ( RCTs ) from the following databases : Medline , Cochrane Central , Cinahl , and LILACS . An electronic search was also conducted using Google Scholar . Study selection Six articles met the eligibility criteria . The risk of bias was assessed following the Cochrane method . Conclusion There is no consistent evidence to support the effectiveness of omega - 3 supplementation in improving cognitive function in AD patients in the short and medium term .
progressive dementia
global cognitive dysfunction