Comparative study of ED mortality risk of US trauma patients treated at level I and level II vs nontrauma centers by Vickers, Brian P., BS, Shi, Junxin, MD, PhD, Lu, Bo, PhD, Wheeler, Krista K., MS, Peng, Jin, MD, MS, Groner, Jonathan I., MD, Haley, Kathryn J., MS, BSN, RN, Xiang, Huiyun, MD, MPH, PhD

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