The burden of headache in China: validation of diagnostic questionnaire for a population-based survey by Lu, Sheng-Yuan, Cao, Xiu-Tang, Zhao, Gang, Yang, Xiao-Su, Quiao, Xiang-Yang, Fang, Yan-Nan, Feng, Jia-Chun, Liu, Ruo-Zhuo, Steiner, Timothy J

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