https://www.boeckler.de/pdf/p_study_hbs_376.pdf
http://hdr.undp.org/sites/default/files/hdr_2019_overview_-_spanish.pdf
https://www.propublica.org/article/maryland-dormu-minimally-invasive-vascular-medicare-medicaid
http://www.oecd.org/els/soc/Risks-That-Matter-2018-Main-Findings.pdf