RT Journal Article SR Electronic T1 When and how to diagnose patent foramen ovale JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 438 OP 440 DO 10.1136/hrt.2004.052233 VO 91 IS 4 A1 F J Pinto YR 2005 UL http://heart.bmj.com/content/91/4/438.abstract AB