1Application of Python in data analysis of trauma epidemiologyChen Du, Xu Feng481-4852General information of low collateral damage ammunition and its killing characteristics to human bodyLi Bingcang486-4893Investigation and preventive measures of meniscus injury in a border troopsWang Zhi, Wang Bing, Li Zhengqiang490-4934Retrospective investigation and analysis of single center of child trauma in outpatient depart- ment of a hospital in Hefei from 2019-2020Yin Chunlin, Li He, Gao Ming494-4985Pre-hospital epidemiological survey of 72,816 cases in Chongqing emergency medical centerLang Xuemei, Liu Chaopu, Ran Xiaoqiong, Shi Lei499-503,5256Epidemiological characteristics of 1,619 cases of traffic injuries caused by electric bicycleLi Zhe, Lyu Liwen, Shen Yin, Zhu Ruikai, Zeng Xi, Zhang Xiaobo, Peng Fenghui504-5087Epidemiological analysis of people exposed to injuries caused by animals in the outpatient clinic of dog bite in a newly-built hospitalSun Ting, Wu Hongyue, Wang Bing, Xu Jiaxuan, Huang Lina, Qin Yuzhen, Tang Tian, Yan Meihua, Tang Huamin509-5128Appropriate immobilization time in bed for patients with non-surgical treatment of traumatic multiple rib fracturesTan Jingyan, Yu Changyong, Liu Wuxin, Li Jinhua, Song Ziyang513-5189Clinical analysis and study of injury factors in elderly patients with hip fractureWang Pu, Wang Huan, Niu Shun, Dong Chuan, Zhang Hongtao, Wang Haipeng, Ma Baoan519-52510Clinical efficacy of suture fixation techniques in the treatment of proximal humeral fractures with locking plates via deltoid approachFu Qiang, Qi Jing, Huang Biwang, Qian Shenglong, Wang Huasong529-53311Advances in the treatment of femoral neck fracturesWang Bomin, Yang Yongliang, Jia Honglei, Hu Fangning539-543,54912Research progress on the treatment of sacroiliac joint complex injuries with extended sacroili- ac joint screwsZhou Wei, Wang Guodong, Liu Ximing544-54913Research progress of human umbilical cord mesenchymal stem cells in the treatment of pan- creatic traumaHan Li, Chen Siping, Zhou Shibo, Zhou Lichen, Zhao Zhirong, Ji Hua, Dai Ruiwu550-55514Issues on emergency first aid for traumaTang Huamin556-558,封3