American Heart Association
Children's Heart Institute
American Heart Association website. Available at:
Patent ductus arteriosus. In:
The Heart Center Encyclopedia.
Children's Hospital Heart Center at the Cincinnati Children's Hospital
Medical Center website. Available at:
http://www.cincinnatichildrens.org. Accessed December 2002.
Understanding congenital heart defects. Mayo Adult Congenital Heart Disease
Clinic, Mayo Foundation for Medical Education and Research website. Available at:
http://www.mayoclinic.com. Accessed October 2002.
Canadian Cardiovascular Society
Canadian Family Physician