1. Department of Anesthesiology, Louisiana State University Health Shreveport, Shreveport, USA
2. Department of Anesthesia, Critical Care, and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, USA
3. Department of Critical Care Medicine, Maryview Medical Center, Portsmouth, USA
4. Old Dominion University, Norfolk, USA
5. Department of Anesthesiology and Pain Medicine, Portsmouth Anesthesia Associates, Portsmouth, USA