1. Social and Administrative Pharmacy Excellence Research (SAPER) Unit, Department of Pharmacy, Faculty of Pharmacy, Mahidol University, Rajathevi, Bangkok, Thailand
2. Health Intervention and Technology Assessment Program (HITAP), Nonthaburi, Thailand
3. Executive Office, EuroQol Research Foundation, Rotterdam, Netherlands
4. Faculty of Medicine, Mahasarakham University, Muang, Mahasarakham Thailand
5. Department of Statistics, Kasetsart University, Bangkok, Thailand