[1] Virginia Commonwealth Univ, Sch Med, Richmond, VA USA
[2] Childrens Hosp Richmond, Pediat Hematol Oncol, Richmond, VA USA
[3] Virginia Commonwealth Univ, Dept Psychol, Box 2018, Richmond, VA 23284 USA
[4] Virginia Commonwealth Univ, Pediat Hematol Oncol, Richmond, VA USA