How a low-cost AI model trained on local data can use handheld ECGs to cost-effectively screen for prior heart attacks in rural India, from Wang, Schubert, Kanakamedala, McKelway, Messac, Reginald, Schilbach, Selvavinayagam, Vaidyanathan, Duflo, and Obermeyer www.nber.org/papers/w34690