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Scherrer-Crosbie M, Steudel W, Hunziker PR, Liel-Cohen N, Ullrich R, Zapol WM, Picard MH.Scherrer-Crosbie M, et al. Among authors: ullrich r.J Am Soc Echocardiogr. 1999 Oct;12(10):834-40. doi: 10.1016/s0894-7317(99)70188-4.J Am Soc Echocardiogr. 1999.PMID: 10511652