1. Dhahran Long Term Hospital, Eastern Health Cluster, Ministry of Health, Dhahran, Saudi Arabia
2. Respiratory Therapy Department, Batterjee Medical College, Khamis Mushait, Saudi Arabia
3. Department of Respiratory Therapy, GA State University, Atlanta, GA, USA
4. Department of Respiratory Care, Prince Sultan Military College of Health Sciences, Dammam, Saudi Arabia
5. Department of Respiratory Therapy, Faculty of Medical Rehabilitation Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
6. Respiratory Therapy Department, Faculty of Applied Medical Sciences, Jazan University, Jazan, Saudi Arabia