CLINICAL AND PARACLINICAL CHARACTERISTICS OF PATIENTS UNDERGOING SURGICAL TREATMENT FOR PECTUS EXCAVATUM USING THORACOSCOPIC-ASSISTED NUSS PROCEDURE AT THE VIETNAM NATIONAL CHILDREN’S HOSPITAL. YHCĐ. 2026;67(CĐ7-Trường ĐH Y Dược Hải Phòng). doi:10.52163/yhc.v67iCD7.5600