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Curtis DS, Fuller-Rowell TE, El-Sheikh M, Carnethon MR, Ryff CD.Curtis DS, et al.Proc Natl Acad Sci U S A. 2017 Aug 15;114(33):8889-8894. doi: 10.1073/pnas.1618167114. Epub 2017 Jul 31.Proc Natl Acad Sci U S A. 2017.PMID: 28760970Free PMC article.Clinical Trial.