1. (2023, June 19). Pfizer. Available online: https://www.pfizer.com/.
2. (2023, June 27). BioNTech. Available online: https://www.biontech.com/int/en/home.html.
3. (2023, June 19). Pioneering mRNA Technology—Moderna. Available online: https://www.modernatx.com/.
4. FDA (2023, June 19). The Drug Development Process, Available online: https://www.fda.gov/patients/learn-about-drug-and-device-approvals/drug-development-process.
5. The powerful placebo;Beecher;J. Am. Med. Assoc.,1955