Amarin Corp Plc (AMRN)

[sts66]

That paper was not published in the JAMA - the lead author apparently works for the JAMA:

Gregory Curfman, MD*
JAMA

*Corresponding Author
[e-mail]

May also be a member of the AMA - from the abstract:

Gregory Curfman

American Medical Association

Furthermore, the Social Science Research Network (papers.ssrn.com) is just a pre-print repository, anyone can submit a paper to the site, nothing there is peer reviewed - most peer reviewed article are published in journals and once they are the journal has copyrights on them, so the final/official/peer reviewed papers are not on ssrn.com.