 Pre-operative Visit The preoperative visit may occur up to 3 months prior to surgery. Patients electing to participate in the study will be consented in a private exam to protect confidentiality. Once consented the subjects will be assigned a subject identification number for study identification purposes, which will consist of A if the patients surgery is performed at Rex Hospital or B if the patients surgery is performed at Hillsborough. A number will then follow the letter. 