@article {leachman1971frequency,
	title = {Frequency of pulmonary hypertension in patients of differing ages with atrial or ventricular septal defects and patent ductus arteriosus.},
	journal = {Acta cardiologica},
	volume = {26},
	number = {5},
	year = {1971},
	pages = {480},
	author = {Leachman, RD and De Franceschi, A and Runge, ThM and Cokkinos, D.V.}
}
