1 Critical Medicine, Obstetrics Intensive Care Unit, Hospital General de Mexico, Dr. Eduardo Liceaga, Mexico City, Mexico.
2 Department of Internal Medicine, Critical Medicine and Pulmonology, Hospital de Alta Especialidad Christus Muguerza, Monterrey, Nuevo Leon, Mexico.
3 Department of Research, Hospital General de Mexico, Dr. Eduardo Liceaga, Mexico City, Mexico.
4 Department of Research, Hospital General de Mexico, Dr. Eduardo Liceaga, Mexico City, Mexico; Department of Radiology, I.M. Sechenov First Moscow State Medical University, Moscow, Russia. Electronic address: ernest.roldan@usa.net.