[1] Indiana Univ, Sch Nursing, Indianapolis, IN 46204 USA
[2] Univ Calif San Francisco, Sch Nursing, San Francisco, CA 94143 USA
[3] Univ Calif San Francisco, Dept Physiol Nursing, San Francisco, CA 94143 USA
[4] Univ Pittsburgh, Sch Nursing, Pittsburgh, PA 15261 USA
[5] Univ Calif San Francisco, Sch Dent, San Francisco, CA USA
[6] Univ Calif San Francisco, Dept Anesthesia & Perioperat Care, San Francisco, CA 94143 USA