Dddt_a_292180 323..330

1Department of Otolaryngology, Central Hospital, Qingdao, Shandong, People’s Republic of China; 2Department of Otolaryngology, Women and Children’s Hospital, Qingdao, Shandong, People’s Republic of China; 3Department of Urology, Zhangqiu District People’s Hospital, Jinan, Shandong, People’s Republic of China; 4Department of Critical Care Medicine, Zhangqiu District People’s Hospital, Jinan, Shandong, People’s Republic of China; 5Department of Otolaryngology, Rizhao Second People’s Hospital, Rizhao, Shandong, People’s Republic of China; 6Department of Radiotherapy, Zibo Central Hospital, Zibo, Shandong, People’s Republic of China