1. School of Pharmaceutical Sciences, Universiti Sains Malaysia, Pinang, Pulau Pinang, Malaysia
2. Discipline of Social and Administrative Pharmacy, Universiti Sains Malaysia, Palau Pinang, Malaysia
3. Discipline of Clinical Pharmacy, Universiti Sains Malaysia, Palau Pinang, Malaysia
4. Respiratory Department, Hospital Pulau Pinang, Ministry of Health, Palau Pinang, Malaysia
5. Department of Clinical Pharmacy, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
6. School of Pharmaceutical Sciences, Universiti Sains Malaysia, Pinang, Pulau Pinang 11800, Malaysia