Understanding influencing attributes of COVID-19 vaccine preference and willingness-to-pay among Chinese and American middle-aged and elderly adults: A discrete choice experiment a... by Xialei Li, Liujun Yang, Guanghua Tian, Bojunhao Feng, Xiaocen Jia, Zonglin He, Taoran Liu, Xianqi Zhao, Mengjie Huang, Wenli Yu, Lian Yu, Wai-Kit Ming

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