1. Heart Failure and Respiratory Distress Clinic, Cardiology Service, Instituto Nacional de Enfermedades Respiratorias “Ismael Cosío Villegas”, Mexico City 14080, Mexico
2. Department of Research in Tobacco Smoking and COPD at Instituto Nacional de Enfermedades Respiratorias “Ismael Cosío Villegas” 2, Mexico City 14080, Mexico
3. Department of Pulmonary Physiology at Instituto Nacional de Enfermedades Respiratorias “Ismael Cosío Villegas”, Mexico City 14080, Mexico
4. Direction for Medical Care in Pneumology at Instituto Nacional de Enfermedades Respiratorias “Ismael Cosío Villegas” 4, Mexico City 14080, Mexico
5. COPD Clinic at Instituto Nacional de Enfermedades Respiratorias “Ismael Cosío Villegas”, Mexico City 14080, Mexico