[1] Hosp Escuela Tegucigalpa, Hematooncol Dept, Tegucigalpa, Honduras
[2] Univ Colorado, Childrens Hosp Colorado, Hematol Oncol, Boulder, CO 80309 USA
[3] Hosp La Mascota, Oncol Pediat, Managua, Nicaragua
[4] Hosp Infantil Dr Robert Reid Cabral, Oncol Pediat, Santo Domingo, Dominican Rep
[5] Univ Tennesee, Hlth Sci Ctr, Memphis, TN USA