A JavaScript implementation of the Vanderbilt "coarctation prediction model" as described in:
A Clinical Prediction Model to Estimate the Risk for Coarctation of the Aorta in the Presence of a Patent Ductus Arteriosus
Soslow et al., JASE, published online 25 September 2013.
View/use it here: http://parameterz.github.io/vanderbilt-cpm