1. School of Public Policy and Administration, Institute of Health Policy and Administration, Xi’an Jiaotong University, Xi’an, China
2. Department of Biomedical Science, College of Medicine, University of Texas Rio Grande Valley; Chinese Medical Center, Dubai, United Arab Emirates
3. Department of Health and Biomedical Sciences, College of Health Affairs, University of Texas Rio Grande Valley, Brownsville, Texas, USA
4. Department of Biostatistics and Epidemiology, College of Public Health, East Tennessee State University, Johnson City, Tennessee, USA
5. Department of Health Sciences, College of Public Health, East Tennessee State University, Johnson, City, Tennessee, USA