[1] Riverside Community Hosp, Dept Anesthesiol, HCA Healthcare, Riverside, CA USA
[2] Univ Calif San Diego, Dept Anesthesiol, Div Pain, La Jolla, CA USA
[3] Univ Calif San Diego, Dept Anesthesiol, Div Reg Anesthesia, La Jolla, CA USA
[4] Univ Calif San Diego, Dept Anesthesiol, Div Perioperat Informat, La Jolla, CA USA
[5] Riverside Community Hosp, Dept Anesthesiol, HCA Healthcare, 4445 Magnolia Ave, Riverside, CA 92501 USA