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Kelber O, Steinhoff B, Kraft K; Working Group “Efficacy and Safety” of Kooperation Phytopharmaka, Bonn, Germany.Kelber O, et al. Among authors: steinhoff b.Phytomedicine. 2012 Mar 15;19(5):472-6. doi: 10.1016/j.phymed.2011.11.008. Epub 2012 Jan 31.Phytomedicine. 2012.PMID: 22301069