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APA Citation
Gao, Q., Wang, F., Hu, L., Yu, J., Liu, R., Wang, Y., & Liu, Y. (2017). changes in Time Spent Outdoors During the Daytime in Rural Populations in Four Geographically Distinct Regions in China: A Retrospective Study. Photochemistry and photobiology, 93, 619–625. http://access.bl.uk/ark:/81055/vdc_100044376991.0x000054