1. Consultant Pulmonologist, Rajagiri Hospital, Kochi, Kerala, India
2. Specialist in Pulmonary Medicine, Aster Medcity, Kochi, Kerala, India
3. Senior Consultant and Head, Department of Pulmonary Medicine, Rajagiri Hospital, Kochi, Kerala, India
4. Consultant Interventional Pulmonologist, Rajagiri Hospital, Kochi, Kerala, India
5. Clinical Epidemiologist, Rajagiri Hospital, Kochi, Kerala, India. E-mail: rajeshdhanya@rediffmail.com