1. Centers for Disease Control and Prevention. FastStats - Physician Office Visits. Centers for Disease Control and Prevention, 10 Oct 2019. www.cdc.gov/nchs/fastats/physician-visits.htm.
2. Shahbandeh M. Total number of retail prescriptions filled annually in the U.S. 2013–2025. Statista, 28 Aug 2020. www.statista.com/statistics/261303/total-number-of-retail-prescriptions-filled-annually-in-the-us/.
3. Surgery 2015–2017 Final Report. NQF: Surgery 2015–2017 Final Report, National Quality Forum, 20 Apr 2017. www.qualityforum.org/Publications/2017/04/Surgery_2015-2017_Final_Report.aspx.
4. Kohn LT, et al. To err is human building a safer health system. Washington D.C., USA: National Academy Press; 2000.
5. Krizek TJ. Surgical error: ethical issues of adverse events. Arch Surg. 2000;135(11):1359. https://doi.org/10.1001/archsurg.135.11.1359.