Evaluation of the effectiveness of multi-frequency ultrasound therapy in the treatment of lactational duct obstruction in postpartum women at Da Nang Hospital for Women and Children. DA NANG JOURNAL OF MEDICINE AND PHARMACY, [S. l.], v. 2, n. 3, p. 64–73, 2026. Disponível em: https://tapchi.ydn.edu.vn/index.php/yduoc/article/view/83. Acesso em: 4 nov. 2026.