RT Journal Article SR Electronic T1 In reply: Prosthetic Ball Free in the Left Ventricle in a Patient with an Aortic Starr-edwards Prosthesis JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 565 OP 565 VO 55 IS 6 A1 Daniel D. Schrader YR 1988 UL http://www.ccjm.org/content/55/6/565.3.abstract AB