1. Dr. Suat Seren Chest Diseases and Thoracic Surgery Training and Research Hospital, Pulmonary Rehabilitation Unit, Izmir, Turkey.
2. Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Izmir Katip Celebi University, Izmir, Turkey.
3. Department of Biostatistics, Faculty of Medicine, Izmir Katip Celebi University, Izmir, Turkey.