Somatic Copy Number Alteration in Circulating Tumor DNA for Monitoring of Pediatric Patients with Cancer oleh Juliana Silveira Ruas, Felipe Luz Torres Silva, Mayara Ferreira Euzébio, Tássia Oliveira Biazon, Camila Maia Martin Daiggi, Daniel Nava, Mayra Troiani Franco, Izilda Aparecida Cardinalli, Alejandro Enzo Cassone, Luiz Henrique Pereira, Ana Luiza Seidinger, Mariana Maschietto, Patricia Yoshioka Jotta