25, 50 & 75 years ago.
Editor-in-Chief.
John P
JP
Harris
D001807:Blood Vessel Prosthesis / Q000266:history*; D013505:Digestive System Surgical Procedures / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D019637:Orthopedic Procedures / Q000266:history*