M. Khoshkhounejad, M. S. Hashemi Nasab, M. Aminsobhani, and R. S. Moayeri, “Challenging Diagnosis of Severe Bilateral Cervicofacial Subcutaneous Emphysema following Root Perforation in a Maxillary Lateral Incisor: A Case Report”, Iran Endod J, vol. 14, no. 3, pp. 220–224, Jul. 2019.