[1] Univ Calif San Francisco, Sch Nursing, San Francisco, CA 94143 USA
[2] Univ Calif Irvine, Coll Hlth Sci, Program Nursing Sci 2, Irvine, CA USA
[3] Univ Calif Los Angeles, Sch Nursing, Los Angeles, CA 90024 USA
[4] Vet Affairs Greater Los Angeles Hlth Care Syst, Nursing Rsch Dept, Los Angeles, CA USA