1 Internal Medicine Clinic and Professional Associates. San Antonio, Texas, USA.
2 Division of Cardiology, University of Texas Health Sciences Center at San Antonio. San Antonio, Texas, USA.
3 Division of Vascular Sugery and Endovascular Therapy, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City.
4 Department of Internal Medicine; Beneficencia Española de Tampico; Tampico.
5 Departamento de Hipertensión Pulmonar y Corazón Derecho, Hospital de Cardiología, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City.
6 Department of Pathology, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, México City. México.
7 Division of Cardiology; Methodist Healthcare Heart Hospital, San Antonio, Texas, USA.