Presidential operations.
Norton
John H
JH
D002763:Cholecystectomy / Q000266:history*; D004322:Drainage; D035082:Federal Government / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D007857:Leadership; D011184:Postoperative Period; D014481:United States; D053039:Ureterolithiasis / Q000266:history* / Q000601:surgery; D013520:Urologic Surgical Procedures / Q000266:history*