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Sipsma H, Callands TA, Bradley E, Harris B, Johnson B, Hansen NB.Sipsma H, et al.J Epidemiol Community Health. 2013 Nov 1;67(11):953-9. doi: 10.1136/jech-2013-202647. Epub 2013 Aug 8.J Epidemiol Community Health. 2013.PMID: 23929617Free PMC article.
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Sipsma H, Ofori-Atta A, Canavan M, Osei-Akoto I, Udry C, Bradley EH.Sipsma H, et al.BMC Public Health. 2013 Apr 1;13:288. doi: 10.1186/1471-2458-13-288.BMC Public Health. 2013.PMID: 23547846Free PMC article.
Sipsma H, Liu Y, Wang H, Zhu Y, Xue L, Alpern R, Dale M, Bradley E.Sipsma H, et al.Int J Qual Health Care. 2013 Sep;25(4):452-8. doi: 10.1093/intqhc/mzt046. Epub 2013 Jun 27.Int J Qual Health Care. 2013.PMID: 23811313