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. 2021 Aug 6;9:689809. doi: 10.3389/fpubh.2021.689809

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Copyright © 2021 Wang, Tan, Qi, Zhang, Liu, Wang, Jiang, Xu, Meng, Chen, Li, Kang, Wu, Shan, Amporfro and Ilia.

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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Comparison of health-care needs and service utilization in 2003, 2008, and 2013. $: USD, United States Dollar. According to the exchange rate of 6.1932 yuan to US$ 1.00.