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Link J, Müller-Hülsbeck S, Grabener M, Stock U, Brossmann J, Heller M.Link J, et al. Among authors: heller m.Rofo. 1995 Sep;163(3):215-8. doi: 10.1055/s-2007-1015976.Rofo. 1995.PMID: 7548867German.