Department of Epidemiology and Biostatistics, School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, China. Global Health Institute, Xi'an Jiaotong University, Xi'an, China. Institute of Medicine, Tribhuvan University, Kathmandu, Nepal. College of Health and Biomedicine, Victoria University, Melbourne, Australia. Nepal Public Health Foundation (NPHF), Maharajgunj, Kathmandu, Nepal. Department of Biostatistics and Epidemiology, College of Public Health, East Tennessee State University, Johnson City, Tennessee.