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. 2019 Feb 13;9(2):e023997. doi: 10.1136/bmjopen-2018-023997

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Seven selected sample provinces on the map of China with referencing countries of equivalent life expectancy in brackets. The figure is adapted from the paper by Liao et al ²⁹. Permission to use has been obtained.