[1] Vanderbilt Univ, Med Ctr, Dept Nursing Res, 1161 21st Ave South D-2106 MCN, Nashville, TN 37232 USA
[2] Vanderbilt Univ, Med Ctr, Dept Anesthesiol, Nashville, TN USA
[3] Vanderbilt Univ, Med Ctr, Ctr Res & Scholarly Dev, Nashville, TN USA
[4] Vanderbilt Univ, Med Ctr, Dept Biostat, Nashville, TN USA
[5] Vanderbilt Univ, Med Ctr, Dept Biostat, Nashville, TN USA
[6] Vanderbilt Univ, Med Ctr, Ctr Res & Innovat Syst Safety, Dept Anesthesiol, Nashville, TN USA