1. Department of Global Medicine, St Jude Children's Research Hospital, Memphis, TN
2. Department of Pediatrics, Hospital Universitario San Ignacio, Bogotá, Colombia
3. Faculty of Health Sciences, Universidad Icesi, Cali, Colombia
4. Discipline of Paediatrics and Child Health, School of Clinical Medicine, University of New South Wales, Sydney, Australia
5. Oncology Unit, Dr Robert Reid Cabral Children's Hospital, Santo Domingo, Dominican Republic