1. Clinical Epidemiology Program, Faculty of Medicine, Chiang Mai University, Thailand.
2. Department of Otolaryngology, Faculty of Medicine, Chiang Mai University, Thailand.
3. Department of Radiology, Faculty of Medicine, Chiang Mai University, Thailand.
4. Center of Health Outcomes Research and Therapeutic Safety (Cohorts), School of Pharmaceutical Sciences, University of Phayao, Phayao, Thailand.
5. Center of Pharmaceutical Outcomes Research (CPOR), Faculty of Pharmaceutical Sciences, Naresuan University, Phitsanulok, Thailand.
6. School of Pharmacy, Monash University Malaysia, Selangor, Malaysia.