36. ANORECTAL FUNCTIONAL ASSESSMENT IN CHILDREN WITH REFRACTORY CONSTIPATION: A CROSS-SECTIONAL STUDY AT CHILDREN’S HOSPITAL 2, HO CHI MINH CITY. Vietnam Journal of Community Medicine, v. 66, n. CĐ16-HNKH Bệnh viện Nhi Đồng 2, 2 Oct.2025.