“The Effect of Pterygopalatine Fossa Block (PPFB) during Endoscopic Sinus Surgery (ESS) on Intraoperative Bleeding: A Randomized Control Trial” (2018) Journal of BP Koirala Institute of Health Sciences, 1(2), pp. 35–41. doi:10.3126/jbpkihs.v1i2.22076.