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. 2021 May 10;9:663189. doi: 10.3389/fpubh.2021.663189

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Copyright © 2021 Ye, An, Xie, Luo and Lin.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Time series charts of the stock closing prices of the three health insurance companies. The data are from NetEase Finance (http://quotes.money.163.com/ stock).