“…Most models provided trauma [7, 8, 10, 11, 14, 17–20, 25, 27]—and/or critical care [6, 7, 10, 11, 18–20, 25, 27], seven studies reported a completely separate service or subunit [5–7, 10, 16, 19, 20]. The elective duties of attending surgeons were cleared in seven, [5, 6, 12–14, 20, 28] eight had protected operating room (OR) time, [6, 8, 11, 13, 14, 19, 26, 27], and six provided ED coverage by attendings and/or residents [5–7, 14, 17, 20]. These components were not frequently described in other articles.…”