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Jensen V, Lundager B, Christensen AL, Fonager K.Jensen V, et al. Among authors: christensen al.Dan Med J. 2014 Apr;61(4):A4804.Dan Med J. 2014.PMID: 24814586Free article.
Christensen AL, Lundbye-Christensen S, Overvad K, Rasmussen LH, Dethlefsen C.Christensen AL, et al.BMC Med Res Methodol. 2012 Nov 20;12:174. doi: 10.1186/1471-2288-12-174.BMC Med Res Methodol. 2012.PMID: 23167658Free PMC article.