Abbreviations
CRS: Chronic Rhinosinusitis; CRSwNP: Chronic Rhinosinusitis with Nasal Polyps; EPOS 2020: European position paper on rhinosinusitis and nasal polyps 2020 guidelines; SD: Standard Deviation; SNOT-22: 22-item Sino-Nasal Outcome Test; VAS: Visual Analog Scale; L-K: Lund-Kennedy; rh-bFGF: recombinant human-basic fibroblast growth factor. ESS: endoscopic sinus surgery. FESS: functional endoscopic sinus surgery.