Due to the nature of this retrospective records review study, informed consent from the subjects is not required and a Request for Waiver of Authorization was submitted. This research involves no more than minimal risk to the subjects, as there will be no subject contact and only the subjects' data will be utilized in the conduct of the research. There is the minimal risk of a breach in confidentiality with the subjects' PHI being disclosed, however, a procedure is in place for the protection of any collected PHI. The waiver of informed consent will not adversely affect the rights and welfare of the subject as this research does not change their standard of care and their confidentiality rights will be respected. This research could not be practicably carried out without the waiver of the informed consent as it is a retrospective chart review study where subject data is needed to meet the objectives of the study and consent cannot be practicably obtained from the patients. Whenever appropriate, the subjects will be provided with additional pertinent information after participation, however, in this case, the subjects' standard of care will not be affected so there will be no need for contact with subjects. The Request for Waiver of Authorization outlines the types of PHI that will be collected, protection and destruction plan for PHI, assurances against PHI re-disclosure, and the need for collection of PHI in order to conduct the study.