[1] Texas Childrens Canc Ctr, Dept Hematol Oncol, Houston, TX 77030 USA
[2] Univ Calif San Francisco, Dept Physiol Nursing, San Francisco, CA 94143 USA
[3] Univ Calif San Francisco, Dept Family Hlth Care Nursing, San Francisco, CA 94143 USA
[4] Univ Missouri, Sch Nursing, Kansas City, MO USA
[5] Childrens Hosp Oakland, Sickle Cell Ctr, Oakland, CA USA