http://eds.a.ebscohost.com/eds/pdfviewer/pdfviewer?sid=dee37fdf-a90d-4ee4-af48-25a4e80c3f9d%40sessionmgr4008&vid=0&hid=4103
http://www.bmj.com/content/351/bmj.h6622.full
http://www.bmj.com/content/352/bmj.i1210.full
you can replace any article -just let me know before that-
also I want you to use very easy language and words . and do grammar mistakes .
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