1. Cullen KA, Hall MJ, Golosinskiy A. Ambulatory surgery in the United States, 2006 [Internet]. Natl Health Stat Rep. 2009;(11):1–25. Hyattsville: National Center for Health Statistics. Available from https://www.cdc.gov/nchs/data/nhsr/nhsr011.pdf.
2. Hall MJ, Schwartzman A, Zhang J, Liu X. Ambulatory surgery data from hospitals and ambulatory surgery centers: United States, 2010 [Internet]. Natl Health Stat Rep. 2017;(102):1–15. Hyattsville: National Center for Health Statistics. Available from https://www.cdc.gov/nchs/data/nhsr/nhsr102.pdf.
3. MedPAC. Chapter 5: Ambulatory surgical center services [Internet]. In: Report to the congress: medicare payment policy. Washington, DC: MedPAC; 2019. Available at http://www.medpac.gov/docs/default-source/reports/mar19_medpac_ch5_sec.pdf?sfvrsn=0.
4. Rawal N, Hylander J, Nydahl PA, Olofsson I, Gupta A. Survey of postoperative analgesia following ambulatory surgery. Acta Anaesthesiol Scand. 1997;41(8):1017–22. https://doi.org/10.1111/j.1399-6576.1997.tb04829.x.
5. Beauregard L, Pomp A, Choinière M. Severity and impact of pain after day-surgery. Can J Anaesth. 1998;45(4):304–11. https://doi.org/10.1007/BF03012019.