Comparison of Current Staging Systems for Sinonasal Inverted Papilloma, Tsuguhisa Nakayama, Yasuhiro Tsunemi, Takashi Kashiwagi, Akihito Kuboki, Shuchi Yamakawa, Wataru Konno, Aya Mori, Jiro Iimura, Toshiharu Tsukidate, Yasuhiro Tanaka, Shin-Ichi Haruna, Am J Rhinol Allergy, 35(1), 64-71, 2021