keywords ACUTE LYMPHOBLASTIC-LEUKEMIA AUTISM SPECTRUM DISORDERS BEHAVIORAL CO-MORBIDITIES CHRONIC ILLNESS CONGENITAL HEART-DISEASE CYSTIC-FIBROSIS Chronic disease Chronic illness Co-occurrence DEVELOPMENTAL COORDINATION DISORDER Developmental disorder JUVENILE IDIOPATHIC ARTHRITIS Life Sciences & Biomedicine Neurosciences Neurosciences & Neurology Pediatric Physical activity Psychology Psychology, Developmental Rehabilitation SCHOOL-AGED CHILDREN SICKLE-CELL-DISEASE Science & Technology Social Sciences