RESULTS	No significant difference was found between successful and failed cases in terms of age ( P = 0.21 ) , sex ( P = 0.37 ) , laterality ( P = 0.46 ) , mode of anesthesia ( P = 0.14 ) , surgeon ( P = 0.26 ) , use of stent ( P = 0.79 ) , or presence of granulation tissue postoperatively ( P = 0.39 ) .\