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Popp FC, Eggert N, Hoy L, Lang SA, Obed A, Piso P, Schlitt HJ, Dahlke MH.Popp FC, et al. Among authors: piso p.J Med Ethics. 2006 Jul;32(7):389-894. doi: 10.1136/jme.2005.013474.J Med Ethics. 2006.PMID: 16816037Free PMC article.