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Ehrsam RE, Bühler A, Müller P, Mauli D, Schumacher PM, Howald H, Imhof PR.Ehrsam RE, et al. Among authors: muller p.Schweiz Rundsch Med Prax. 1991 Feb 12;80(7):145-50.Schweiz Rundsch Med Prax. 1991.PMID: 2008547Clinical Trial.German.