[1] Univ Ferrara, Dept Human Morphol Surg & Expt Med, Sect Gen & Thorac Surg, Sch Med, Ferrara, Italy
[2] Univ Chicago, Pritzker Sch Med, Dept Surg, Chicago, IL 60637 USA
[3] Univ Chicago, Pritzker Sch Med, Ctr Simulat, Chicago, IL 60637 USA
[4] Biol Sci Div, Chicago, IL USA
[5] Univ Chicago, MacLean Ctr Clin Med Eth, Chicago, IL 60637 USA