MILAN, Italy & ROCHESTER, Minn.--(BUSINESS WIRE)--Drago Cerchiari, Chief Executive Officer of the Sorin Group (MIL:SRN), Europe’s largest cardiovascular medical device group, and Mayo Clinic, announce today that they have signed a three-year agreement to collaborate in research efforts in the development of an aortic valve-replacement procedure that uses a collapsible heart valve implanted in a beating heart.