Diamantopoulou Ε., and Papaioannou Α. “Differences in Physical Activity, Depression and Coping Stress Strategies for Children With Chronic Illness”. Inquiries in Physical Education and Sport, vol. 5, no. 2, Sept. 2007, pp. 215-2, https://journals.lib.uth.gr/index.php/inquiries/article/view/1198.