[0]https://www.mitpressjournals.org/doi/10.1162/JINH_a_00212 (I could only find this abstract about US use.)
[1]https://www.theatlantic.com/health/archive/2016/04/the-drugs...
http://www.nbcnews.com/id/3071789/ns/us_news-only/t/go-pills...