China Bans All Types of Fentanyl, Cutting Supply of Deadly Drug to U.S. and Fulfilling Pledge to Trump - The New York Times
https://www.nytimes.com/2019/04/01/world/asia/china-bans-fentanyl-trump.html
McKinsey Proposed Paying Pharmacy Companies Rebates for OxyContin Overdoses - The New York Times
https://www.nytimes.com/2020/11/27/business/mckinsey-purdue-oxycontin-opioids.html
New class of painkiller found in the mud - Institute for Molecular Bioscience - University of Queensland
https://imb.uq.edu.au/article/2019/10/new-class-painkiller-found-mud
Study: Higher opioid doses fail to lessen pain | EurekAlert! Science News
https://www.eurekalert.org/pub_releases/2020-02/varc-sho020520.php
Vitamin D deficiency may increase risk for addiction to opioids and ultraviolet rays | EurekAlert! Science News
https://www.eurekalert.org/pub_releases/2021-06/mgh-vdd060821.php