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Stanger, Olaf; Gisler, Fabian; Londono, Martina Correa (2015). Valve-in-valve: Estimating the risk of ostium obstruction in failed sorin stentless valves. Journal of thoracic and cardiovascular surgery, 149(2), pp. 644-645. Mosby 10.1016/j.jtcvs.2014.09.087