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Sun F, Matthews SA, Yang TC, Hu MH.Sun F, et al. Among authors: matthews sa.Ann Epidemiol. 2020 Dec;52:54-59.e1. doi: 10.1016/j.annepidem.2020.07.014. Epub 2020 Jul 28.Ann Epidemiol. 2020.PMID: 32736059Free PMC article.
Tarlov E, Zenk SN, Matthews SA, Powell LM, Jones KK, Slater S, Wing C.Tarlov E, et al. Among authors: matthews sa.Prev Chronic Dis. 2017 Nov 9;14:E111. doi: 10.5888/pcd14.160590.Prev Chronic Dis. 2017.PMID: 29120701Free PMC article.