1. OPTN. Organ Procurement and Transplant Network. [cited 9 January 2021]. Available from: https://optn.transplant.hrsa.gov/
2. GAO@100. United Network for Organ Sharing. [cited 9 January 2021]. Available from: https://www.gao.gov/products/b-416248
3. The official Web site for Code of Federal Regulations. For further information on OPTN policies by HHS. [cited 9 January 2021]. Available from: https://ecfr.federalregister.gov/current/title-42/chapter-I/subchapter-K
4. ODT CLINICAL. For further information on NHS Blood and Transplant. [cited 10 January 2021]. Available from: https://www.odt.nhs.uk/
5. The official Web site. For further information on European Transplant. [cited 10 January 2021]. Available from: https://www.eurotransplant.org/