1. Yu‐Li HospitalDepartment of Health, Executive YuanTaiwan
2. Institute of Occupational Medicine and Industrial Hygiene, College of Public Health, National Taiwan UniversityTaiwan
3. Department of Internal Medicine and Department of Environmental and Occupational MedicineNational Taiwan University HospitalTaiwan
4. Institute of Health Policy and Management, College of Public Health, National Taiwan UniversityTaiwan