Diller, Gerhard-Paul Predicting the risks of pregnancy in congenital heart disease: the importance of external validation. [electronic resource] - Heart (British Cardiac Society) Sep 2014 - 1311-2 p. digital Publication Type: Editorial; Comment ISSN: 1468-201X Standard No.: 10.1136/heartjnl-2014-306060 doi Subjects--Topical Terms: FemaleHeart Defects, Congenital--complicationsHumansPregnancyPregnancy Complications, Cardiovascular--etiology