1. Department of Pharmacy Ear ‐ Nose ‐ Throat Hospital in Ho Chi Minh city Ho Chi Minh City Vietnam
2. Department of Economic and Administrative Pharmacy, Faculty of Pharmacy Pham Ngoc Thach University of Medicine Ho Chi Minh City Vietnam
3. Department of Economic and Administrative Pharmacy, Faculty of Pharmacy Ton Duc Thang University Ho Chi Minh City Vietnam