Title {1}	Efficacy and safety of butylphthalide in secondary prevention of stroke: study protocol for a multicenter, real world trial based on Internet
Trial registration {2a and 2b}	Chinese Clinical Trial Registry (ChiCTR). Trial registration number: ChiCTR2000034481. Registered on 6 July 2020, http://www.chictr.org.cn/showproj.aspx?proj=55800 The Universal Trial Number (UTN) is U1111-1256–0166
Protocol version {3}	20,200,821
Funding {4}	Shijiazhuang Pharmaceutical Group Pharmaceutical Co. Ltd Shaanxi Provincial Natural Science Basic Research Program (NO.2019JQ-251) Xi’an International Medical Center Hospital Hospital Level Project (NO.2020ZD007)
Author details {5a}	Junchao Lv Xijing Hospital, Fourth Military Medical University Xi’an 710,000, Shaanxi Province, China https://996524996@qq.com Di Zhao Xijing Hospital, Fourth Military Medical University Xi’an 710,000, Shaanxi Province, China https://zhaoditieren@163.com Correspondence author: Zhen Xie* School of Medicine, Northwestern University of China, No. 229, Taibai north road, Beilin district, Xi’an710000, Shaanxi province, China https://xiezhenhh@163.com Gang Zhao 1. Xijing Hospital, Fourth Military Medical University, No. 127 Changle west road, Xincheng district Xi’an 710000, Shaanxi Province, China School of Medicine, Northwestern University of China, No. 229, Taibai north road, Beilin district, Xi’an 710000, Shaanxi province, China https://zhaogang@nwu.edu.cn
Name and contact information for the trial sponsor {5b}	This study is funded by Shijiazhuang Pharmaceutical Group Pharmaceutical Co. Ltd.(Shijiazhuang, China), Shaanxi Provincial Natural Science Basic Research Program (NO.2019JQ-251), and Xi’an International Medical Center Hospital Hospital Level Project (NO.2020ZD007)
Role of sponsor {5c}	The funding bodies have no role in the trial design or interpretation of the data