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Chen X, Scholl TO.Chen X, et al. Among authors: scholl to.Int J Environ Res Public Health. 2015 Dec 22;13(1):ijerph13010008. doi: 10.3390/ijerph13010008.Int J Environ Res Public Health. 2015.PMID: 26703679Free PMC article.
Scholl TO, Chen X.Scholl TO, et al.Matern Child Health J. 2002 Dec;6(4):255-61. doi: 10.1023/a:1021162117177.Matern Child Health J. 2002.PMID: 12512767