The following portion is from a previous student's speech. Identify which part of the introduction it belongs to: Because of this apparent risk, according to the Accreditation Council on Graduate Medical Education (ACGME) in 2003, ACGME implemented new rules to limit the maximum number of work hours for medical residents per week to 80 hours, and a 24-hour limit per shift. However, further changes must be made. Twenty-four hour shifts will still induce fatigue, as can be seen in the Libby Zion case where the medical residents were already fatigued after 18 hours of work