1. Department of Thoracic Surgery, Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
2. School of Basic Medical Sciences, Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
3. Hebei Province Key Laboratory of Environment and Human Health, Department of Epidemiology and Statistics, School of Public Health, Hebei Medical University, Shijiazhuang, Hebei, China (mainland)
4. School of Basic Medical Sciences, Hebei Medical University, Shijiazhuang, Hebei, Christmas island
5. Department of Endoscopy, Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei, China (mainland)