[1] Oregon Hlth & Sci Univ, Sch Nursing, Portland, OR 97201 USA
[2] Oregon Hlth & Sci Univ, Dept Obstet & Gynecol, 3181 SW Sam Jackson Pk Rd,Mail Code L-446, Portland, OR 97201 USA
[3] Oregon Hlth & Sci Univ, Dept Anesthesiol & Perioperat Med, Portland, OR 97201 USA
[4] Oregon Hlth & Sci Univ, Dept Med Informat & Clin Epidemiol, Portland, OR 97201 USA
[5] Oregon Hlth & Sci Univ, Dept Emergency Med, Portland, OR 97201 USA
[6] Oregon Hlth & Sci Univ, Knight Canc Inst, Div Oncol Sci, Portland, OR 97201 USA
[7] OHSU PSU Sch Publ Hlth, Portland, OR USA