[1] Cook Childrens Hlth Care Syst, Dept Pediat Hematol Oncol, Ft Worth, TX 76104 USA
[2] Cook Childrens Hlth Care Syst, Res Operat, Ft Worth, TX USA
[3] Univ North Texas, Hlth Sci Ctr, Texas Coll Osteopath Med, Ft Worth, TX USA
[4] Texas Christian Univ, Harris Coll Nursing & Hlth Sci, Ft Worth, TX 76129 USA