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Heber E, Ebert DD, Lehr D, Nobis S, Berking M, Riper H.Heber E, et al. Among authors: lehr d.BMC Public Health. 2013 Jul 15;13:655. doi: 10.1186/1471-2458-13-655.BMC Public Health. 2013.PMID: 23855376Free PMC article.Clinical Trial.