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Sadd BM, Kleinlogel Y, Schmid-Hempel R, Schmid-Hempel P.Sadd BM, et al.Biol Lett. 2005 Dec 22;1(4):386-8. doi: 10.1098/rsbl.2005.0369.Biol Lett. 2005.PMID: 17148213Free PMC article.