RT Journal Article SR Electronic T1 Patent foramen ovale and the risk of cryptogenic stroke JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 425 OP 426 DO 10.3949/ccjm.81a.14066 VO 81 IS 7 A1 Tobis, Jonathan YR 2014 UL http://www.ccjm.org/content/81/7/425.abstract AB