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3. Agency for Healthcare Research and Quality. Introduction to the HCUP National Inpatient Sample (NIS) 2013. Rockville, MD: US Department of Health and Human Services, Agency for Healthcare Research and Quality; 2015. https://www.hcup-us.ahrq.gov/db/nation/nis/NISIntroduction2013.pdf
4. National Birth Defects Prevention Network. Appendix 3.1. Birth defects descriptions for NBDPN core, recommended, and extended conditions. In: Botto L, Carey J, Cassel C, et al., eds. Guidelines for conducting birth defects surveillance. Atlanta, GA: National Birth Defects Prevention Network; 2015.
5. Agency for Healthcare Research and Quality. Cost-to-charge ratio files: 2013 National Inpatient Sample (NIS) user guide. Rockville, MD: US Department of Health and Human Services, Agency for Healthcare Research and Quality; 2015. https://www.hcup-us.ahrq.gov/db/state/CCR2013NISUserGuide.pdf