A quantitative study of China′s policy texts of vaccine clinical trials based on "tool–element–strength" three-dimensional analytical framework
1School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
2Hubei Provincial Center for Disease Control and Prevention, Wuhan 430079, China
3Health Management and Policy Research Center, Shandong University, Jinan 250011, China
4Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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