NEWSPAPER
https://www.medicalnewstoday.com/articles/270272.php

INTERNET ARTICLE
https://my.clevelandclinic.org/health/articles/benefits-of-chocolate-heart-health?view=print

Professional Journal
https://content.iospress.com/download/journal-of-alzheimers-disease/jad160142?id=journal-of-alzheimers-disease%2Fjad160142
or
https://content.iospress.com/articles/journal-of-alzheimers-disease/jad160142

Only use those sources. 
Double spaced.

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