1. Department of Nuclear Cardiology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico; School of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico
2. School of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico
3. Department of Nuclear Cardiology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico
4. Department of Nuclear Cardiology, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico; Department of Echocardiography, Centro Médico ABC, I.A.P., Mexico City, Mexico