Hashemian, F., Sadegh, S., Jahanshahi, J., Seif Rabiei, M. A., & Hashemian, F. "Effects of Vitamin D Supplementation on Recurrence of Nasal Polyposis after Endoscopic Sinus Surgery", Iranian Journal of Otorhinolaryngology, 32, 1, 2020, 21-28. doi: 10.22038/ijorl.2019.37766.2241