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Proctor SP, Heaton KJ, Dos Santos KD, Rosenman ES, Heeren T.Proctor SP, et al. Among authors: heaton kj.Scand J Work Environ Health. 2009 Oct;35(5):349-60. doi: 10.5271/sjweh.1348.Scand J Work Environ Health. 2009.PMID: 19730757Free article.