Khan, Amir Ali, et al. “RESULTS OF IRRIGATION OF MAXILLARY SINUS WITH METRONIDAZOLE AFTER ANTRAL WASHOUT IN PATIENTS WITH CHRONIC MAXILLARY SINUSITIS: Irrigation of Maxillary Sinus With Metronidazole After Antral Washout”. Pakistan Armed Forces Medical Journal, vol. 68, no. 2, Apr. 2018, pp. 241-44, https://pafmj.org/PAFMJ/article/view/324.