1 Trinity College of Arts & Sciences, Duke University, Durham, NC, USA.
2 School of Medicine, University of California San Diego, La Jolla, San Diego, CA, USA.
3 Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Boston, MA, USA.
4 Department of Anesthesiology, University of California San Diego, 9300 Campus Point Drive MC7770, La Jolla, San Diego, CA, 92037-7770, USA.
5 Department of Anesthesiology, University of California San Diego, 9300 Campus Point Drive MC7770, La Jolla, San Diego, CA, 92037-7770, USA. ragabriel@health.ucsd.edu.
6 Department of Medicine, Division of Biomedical Informatics, University of California, La Jolla, San Diego, CA, USA. ragabriel@health.ucsd.edu.