1. Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
2. Department of Emergency Medicine, Penn State Hershey Medical Center, Hershey, PA, USA
3. Department of Anesthesiology and Perioperative Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
4. Department of Biostatistics, School of Public Health, The University of Alabama at Birmingham, Birmingham, AL, USA
5. University of Virginia School of Medicine, Charlottesville, VA, USA