http://www.bmj.com/content/343/bmj.d4521 http://www.bmj.com/content/343/bmj.d4521 https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/485349 http

http://www.bmj.com/content/343/bmj.d4521 http://www.bmj.com/content/343/bmj.d4521 https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/485349 https://jamanetwork.com/journals/jamainternalmedicine/fullar... https://archive.org/details/pubmed-PMC3831097 https://archive.org/details/pubmed-PMC3831097 This is Spain, Denmark, and England, which might be safer than the US, but still some significant results. I'm also not sure if there are other studies that found the opposite--a systematic review would be nice.