2. METHODS
2.1 Design and Setting
This study used a cross-sectional design. We enrolled 7-18-year-old children with solid tumors after they were consented to participate in this study from the AFLAC Cancer and Blood Disorder Center in Children’s Healthcare of Atlanta (CHOA) in Atlanta, Georgia. Age, sex, and race-matched healthy controls were recruited via flyers, online e-news blast, and ResearchMatch (a disease-neutral web-based recruitment registry).