1. China has 370 million bicycles and 181 million electric bicycles. 2014. http://finance.china.com.cn/roll/20140427/2366887.shtml.
2. Traffic Accident statistics in China. http://data.stats.gov.cn/easyquery.htm?cn=C01.
3. Trauma Guidelines of Stanford. http://med.stanford.edu/content/dam/sm/scalpel/documents/GoalsAndObj/Stanford_Trauma_Guidelines.2018-adult-and-peds.pdf.
4. Average length of hospital stay by diagnostic category, 2003;bite;J Natl Cancer Inst,2005
5. Comparing fractur patterns of younger versus older riders involved in nonfatal motorcycle accidents;Ashie;Traffic Inj Prev,2018