Niazi, S. A.; Maqbool, S.; Khan, Z. U.; Hakim, A.; Aasim, M. U.; Maqsood, S.; Riaz, Y. EFFICACY OF FUNCTIONAL ENDOSCOPIC SINUS SURGERY(FESS) IN TREATMENT OF POST NASAL DRIP (PND) AS AN ANCILLARY PROCEDURE: A COMPARATIVE STUDY. PAFMJ 2021, 71, S573-76.