1 Internal Medicine Service and Critical Patient Unit, Viña del Mar, Chile. Electronic address: drauriopiotr@gmail.com.
2 Respiratory Therapy UC-Christus Health Network Clinical Hospital, School of Kinesiology, Faculty of Rehabilitation, Andres Bello University, Santiago, Chile.
3 Central University Hospital of Asturias, Oviedo, Spain.
4 Hospital Universitari i Politècnic La Fe, València, Spain.