1. REGULATION (EU) 2017/745 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL, https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32017R0745.
2. COUNCIL DIRECTIVE 93/42/EEC https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:31993L0042&from=EN.
3. COUNCIL DIRECTIVE 90/385 /EEC https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:31990L0385&from=EN.
4. 21 U.S. Code Chapter 9 - FEDERAL FOOD, DRUG, AND COSMETIC ACT https://uscode.house.gov/view.xhtml?path=/prelim@title21/chapter9&edition=prelim.
5. Ongoing problems with metal-on-metal hip implants;Heneghan;BMJ,2012