1. Department of Epidemiology and Health Statistics, School of Public Health, Zunyi Medical University, Zunyi, Guizhou, China
2. Center For Injury Research and Policy & Center For Pediatric Trauma Research, The Research Institute at Nationwide Children's Hospital, The Ohio State University College of Medicine, Columbus, OH, USA
3. School of Nursing, Zunyi Medical University, Zunyi, Guizhou, China