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Krayenbuehl HP, Hess OM, Ritter M, Monrad ES, Hoppeler H.Krayenbuehl HP, et al. Among authors: ritter m.Eur Heart J. 1988 Apr;9 Suppl E:19-23. doi: 10.1093/eurheartj/9.suppl_e.19.Eur Heart J. 1988.PMID: 2969811Review.
Schwitter J, Eberli FR, Ritter M, Turina M, Krayenbuehl HP.Schwitter J, et al. Among authors: ritter m.Br Heart J. 1992 Feb;67(2):161-9. doi: 10.1136/hrt.67.2.161.Br Heart J. 1992.PMID: 1531759Free PMC article.
Eberli FR, Ritter M, Schwitter J, Bortone A, Schneider J, Hess OM, Krayenbuehl HP.Eberli FR, et al. Among authors: ritter m.Eur Heart J. 1991 Feb;12(2):127-38. doi: 10.1093/oxfordjournals.eurheartj.a059858.Eur Heart J. 1991.PMID: 2044545Free article.
Krayenbuehl HP, Ritter M, Hess OM, Hirzel H.Krayenbuehl HP, et al. Among authors: ritter m.Eur Heart J. 1987 Aug;8 Suppl C:1-9. doi: 10.1093/eurheartj/8.suppl_c.1.Eur Heart J. 1987.PMID: 3315666Free article.Review.
Nonogi H, Hess OM, Ritter M, Krayenbuehl HP.Nonogi H, et al. Among authors: ritter m.Br Heart J. 1988 Jul;60(1):30-8. doi: 10.1136/hrt.60.1.30.Br Heart J. 1988.PMID: 3408616Free PMC article.