I've heard that the U.S. Food and Drug Administration (FDA) said Pfizer's Comirnaty and BioNTech formulas are distinctly different in their vaccine approval letter. Is that true?
Looking for the differences between LASIK (laser-assisted in-situ keratomileusis) surgery and SMILE (small incision lenticule extraction)? SMILE is the latest vision correction surgery and the most recently approved.