1 General Hospital of San Juan del Rio and Santo Tomas Hospital. Intensive care unit, Queretaro, Mexico.
2 Department of Critical Care Medicine, Instituto Nacional de Cancerologia, Mexico City, Mexico.
3 Department of Critical Care Medicine, Instituto Nacional de Cancerologia, Mexico City, Mexico. snamendyss@medicasur.org.mx.
4 Department of Critical Care Medicine, Instituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran, Mexico City, Mexico. snamendyss@medicasur.org.mx.
5 Department of Critical Care Medicine, Hospital Medica Sur, 14050, Mexico City, Mexico. snamendyss@medicasur.org.mx.