Life expectancy and opioids in US

https://www.investors.com/politics/editorials/life-expectancy-decline-obamacare/

https://www.gapminder.org/answers/how-does-income-relate-to-life-expectancy/


https://www.google.fr/amp/s/www.washingtonpost.com/amphtml/opinions/the-truth-about-deaths-of-despair/2017/09/12/15aa6212-8459-11e7-902a-2a9f2d808496_story.html

http://www.nber.org/papers/w24440


http://www.nber.org/papers/w23645