1 Department of Hemodynamic, General Hospital of the National Medical Center "La Raza" Mexican Institute of Social Security (IMSS), Mexico City, Mexico, PhD Program in Medical Sciences, Universidad de La Frontera, Temuco, Chile, ayeyigmendez@comunidad.unam.mx.
2 Department of Anesthesia, New York University, American British Cowdray, Medical Center Mexico City, Mexico City, Mexico.
3 Center of Excellence in Morphological and Surgical Studies (CEMyQ), Universidad de La Frontera, Temuco, Chile.