1 Department of Medicine, The University of British Columbia, Vancouver, Canada; Centre for Heart Lung Innovation, Providence Health Care Research Institute, The University of British Columbia and St. Paul's Hospital, Vancouver, Canada.
2 Internal Medicine Department, Hospital Regional de Alta Especialidad de la Peninsula de Yucatan, Yucatan, Mexico.
3 Respiratory and Thoracic Surgery Unit, Hospital Regional de Alta Especialidad de la Peninsula de Yucatan, Yucatan, Mexico.
4 Centre for Heart Lung Innovation, Providence Health Care Research Institute, The University of British Columbia and St. Paul's Hospital, Vancouver, Canada; Department of Physical Therapy, The University of British Columbia, Vancouver, Canada.
5 Respiratory and Thoracic Surgery Unit, Hospital Regional de Alta Especialidad de la Peninsula de Yucatan, Yucatan, Mexico. Electronic address: [email protected].