Gildasio S De Oliveira1, Mathew Thran2. 1. Alpert School of Medicine, Brown University, Providence, USA; Department of Anesthesiology, Rhode Island Hospital, Providence, RI, USA; Department of Surgery, Alpert School of Medicine, Brown University, Providence, RI, USA; Department of Health Services Research, School of Public Health, Providence, RI, USA. Electronic address: gildasio.deoliveira@lifespan.org. 2. Alpert School of Medicine, Brown University, Providence, USA; Department of Anesthesiology, Rhode Island Hospital, Providence, RI, USA; Department of Surgery, Alpert School of Medicine, Brown University, Providence, RI, USA; Department of Health Services Research, School of Public Health, Providence, RI, USA.