[1] Univ Pittsburgh, Med Ctr, Dept Nursing Educ & Res, UPMC Shadyside, Pittsburgh, PA 15232 USA
[2] Univ Pittsburgh, Dept Epidemiol, Grad Sch Publ Hlth, Pittsburgh, PA 15232 USA
[3] Univ N Carolina, Sch Nursing, Chapel Hill, NC USA
[4] Univ Pittsburgh, Sch Med, Dept Psychiat, Pittsburgh, PA 15232 USA
[5] Univ Pittsburgh, Grad Sch Publ Hlth, Dept Biostat, Pittsburgh, PA 15232 USA