Pre-attack and pre-episode symptoms in cluster headache: a multicenter cross-sectional study of 327 Chinese patients by Ke Li, Shuping Sun, Zhanyou Xue, Sufen Chen, Chunyang Ju, Dongmei Hu, Xiaoyu Gao, Yanhong Wang, Dan Wang, Jianjun Chen, Li Li, Jing Liu, Mingjie Zhang, Zhihua Jia, Xun Han, Huanxian Liu, Mianwang He, Wei Zhao, Zihua Gong, Shuhua Zhang, Xiaoxue Lin, Yingyuan Liu, Shengshu Wang, Shengyuan Yu, Zhao Dong

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