Wrong site surgery: The standard protocol for site identification will be performed for all patients. The surgeon's initials will be identified during the time-out procedure. The time out will be performed by the nurse in the operating room according to the protocol of the Johns Hopkins Bayview Medical Center. The nurse will read the consent form, confirm the site identification mark with the surgeon and the anesthesiologist. The side will be confirmed with the radiographs and the consent form for the procedure. The time out will be performed two times to prevent any possibility of wrong site surgery. This is a technique used by the neurosurgical services where site marking is difficult. The site will be identified both before and after the skin preparation.