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Buechel RR, Stephan FP, Sommer G, Bremerich J, Zellweger MJ, Kaufmann BA.Buechel RR, et al. Among authors: zellweger mj.J Am Soc Echocardiogr. 2013 Apr;26(4):428-35. doi: 10.1016/j.echo.2013.01.001. Epub 2013 Feb 11.J Am Soc Echocardiogr. 2013.PMID: 23411366