1. Department of Out patients Care, Echocardiography, Nuclear medicine National Instituto of Cardiology Ignacio Chávez, Juan Badiano No.1, Colonia Sección XVI, Tlalpan, Mexico City 14080, Mexico
2. Department of Cardiovascular Medicine, Mayo Clinic, 200 1st St Sw, Rochester, MN, USA
3. Intermediate Care Unit Medica Sur Clinical Foundation, Puente de Piedra 150, Toriello Guerra, Delegación Tlalpan, Ciudad de México, Mexico City, Mexico
4. Hospital Regional ISSSTE, Av Díaz Mirón SN Colonia, Moderno, 91910 Veracruz, Mexico
5. Autonomous University of Nayarit, Edificio de la Unidad Academica de Medicina, Ciudad de la cultura “Amado Nervo” CP: 63000 Tepic Nayarit, Mexico