There is no presumption that a doctor possesses the required skill and knowledge required of him by the controlling medical standards and that in treating his patients, that he applies that knowledge and skill. Williams v. Golden, 95-2712 (La. App. 4 Cir. 7/23/97), 699 So.2d 102, 106-07, writ denied, 1997-2788 (La. 1/30/98), 709 So.2d 708.