1. National Center for Health Statistics. Health, United States, 2016: With Chartbook on Long-term Trends in Health [Internet]. Hyattsville; 2017. Available from: https://www.cdc.gov/nchs/data/hus/hus16.pdf .
2. Center for Disease Control and Prevention. National Hospital Ambulatory Medical Care Survey: 2011 Outpatient Department Summary Tables [Internet]. 2012. Available from: https://www.cdc.gov/nchs/data/ahcd/nhamcs_outpatient/2011_opd_web_tables.pdf .
3. Hing E, Rui P, Palso K. National Ambulatory Medical Care Survey: 2013 State and National Summary Tables [Internet]. 2014. Available from: http://www.cdc.gov/nchs/ahcd/ahcd_products.htm .
4. Rui P, Kang K, Albert M. National Hospital Ambulatory Medical Care Survey: 2013 Emergency Department Summary Tables [Internet]. 2014. Available from: http://www.cdc.gov/nchs/data/ahcd/nhamcs_emergency/2013_ed_web_tables.pdf .
5. Stausberg J. International prevalence of adverse drug events in hospitals: an analysis of routine data from England, Germany, and the USA. BMC Health Serv Res. 2014;14:125.