1 Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India.
2 Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India. inderpgi@outlook.com.
3 Intensive Care Unit, Hospital Universitario de Getafe, Madrid, Spain.
4 CIBER de Enfermedades Respiratorias, Madrid, Spain.
5 Intensive Care Unit, Hospital de Torrejón, Madrid, Spain.
6 Hospital Español, Montevideo, Uruguay.
7 Department of Clinical Biostatistics, Hospital Ramón y Cajal, IRICYS & CIBERESP, Madrid, Spain.