1. Department of Surgery, Emory University School of Medicine, Grady Memorial Hospital, Atlanta, GA, USA
2. Department of Surgery, Eisenhower Army Medical Center, Fort Gordon, GA, USA
3. Department of Surgery, Morehouse School of Medicine, Grady Memorial Hospital, Atlanta, GA, USA
4. Department of Anesthesiology, Emory University School of Medicine, Emory University Hospital, Atlanta, GA, USA