1. Princess Máxima Center for Pediatric Oncology; Heidelberglaan 25 Utrecht Netherlands 3584 CS
2. Princess Máxima Center for Pediatric Oncology; c/o Cochrane Childhood Cancer; Heidelberglaan 25 Utrecht Netherlands 3584 CS
3. Centro de Pesquisa, Instituto Nacional do Cancer; Pediatric Hematology-Oncology Program; Rio de Janeiro RJ Brazil