1 Department of Anesthesia, Centro Medico Nacional, Hospital de Especialidades "La Raza", Paseo de las Jacarandas sin numero, La Raza, Azcapotzalco, 02990, Mexico City, México. diego-piloto@hotmail.com.
2 Department of Bariatric and Preoperative Surgery, Baja Hospital and Medical Center, Tijuana, Baja California, México.
3 Department of Intensive Care, Hospital General de Zona #1, Saltillo, Coahuila, México.
4 Department of Intensive Care, Hospital San Juan del Rio, San Juan del Río, Queretaro, México.
5 Department of Intensive Care, Centro Medico Nacional, Hospital de Especialidades "La Raza", Mexico City, México.