Characterization of Maxillary Sinus in Patients with Facial Pain using Ultrasound. Global Journal of Medical Research, [S. l.], v. 13, n. D2, p. 3–6, 2013. Disponível em: https://medicalresearchjournal.org/index.php/GJMR/article/view/369. Acesso em: 13 aug. 2026.