1. Department of Otorhinolaryngology–Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
2. Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
3. Department of Anesthesiology, Peking Union Medical College Hospital, Dongcheng District, Beijing
4. Department of Surgery, Division of Traumatology and Surgical Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA