1. Department of Preventive and Social Medicine, Faculty of MedicineChulalongkorn UniversityBangkokThailand
2. Community Health Unit, Faculty of Medicine Vajira HospitalNavamindradhiraj UniversityBangkokThailand
3. Department of International HealthJohns Hopkins Bloomberg School of Public HealthBaltimoreMDUSA
4. Thailand Research Center for Health Services System (TRC‐HS), Faculty of MedicineChulalongkorn UniversityBangkokThailand