University of Alberta - Division of Pulmonary Medicine, Medical Research Institute of New Zealand, Medical Research Institute of New Zealand, University Hospitals Birmingham NHS Foundation Trust - Department of Respiratory Medicine, University of Barcelona - Department of Clinical Psychology and Psychobiology, Ataturk University - Department of Chest Diseases, University of Alberta - Division of Pulmonary Medicine, Supreme Institute of Management and Technology - Department of Medical Laboratory Technology, Synergy Respiratory and Cardiac Care, Jindal Clinics, Jindal Clinics, Ataturk University - Department of Chest Diseases, Synergy Respiratory and Cardiac Care, Synergy Respiratory and Cardiac Care, Apollo Gleneagles Hospital - Department of Allergy & Immunology, Barrackpore Rashtraguru Surendrananth College - Department of Psychology, University Hospitals Birmingham NHS Foundation Trust - Department of Respiratory Medicine, University of Ferrara - Department of Environmental and Prevention Sciences, Medical Research Institute of New Zealand, University Hospitals Birmingham NHS Foundation Trust - Department of Respiratory Medicine and University of Alberta - Division of Pulmonary Medicine