Duffels MGJ, Engelfriet PM, Berger RMF, van Loon RLE, Hoendermis E, Vriend JWJ, van der Velde ET, Bresser P, Mulder BJM. Pulmonary arterial hypertension in congenital heart disease: An epidemiologic perspective from a Dutch registry. International Journal of Cardiology. 2007 Aug;120(2):198–204. doi: 10.1016/j.ijcard.2006.09.017.