[1] Univ Virginia, Sch Nursing, Dept Acute & Specialty Care, Charlottesville, VA 22903 USA
[2] Univ South Carolina, Dept Hlth Serv Policy & Management, Columbia, SC 29208 USA
[3] Univ Tennessee, Coll Nursing, Knoxville, TN 37996 USA
[4] Boston Childrens Hosp, Dept Pediat Oncol, Div Populat Sci, Dana Farber Canc Inst, Boston, MA USA