Acute exacerbation of chronic subjective tinnitus: a cross-sectional study oleh Bi-Xing Fang, Yin-Fei Liang, Jing Gu, Zhi-Cheng Li, Zhen-Zhi Li, Jin-Tian Cen, Lian-Xiong Yuan, Ke Zheng, Dan Chen, Xiang-Li Zeng, Jing Ni