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2. Agency for Healthcare Research and Quality 2008 Introduction to the HCUP Kids' Inpatient Database (KID), 2006. Sample Weights http://www.hcup-us.ahrq.gov/db/nation/kid/kid_2006_introduction.jsp#discharge
3. Agency for Healthcare Research and Quality 2010 Healthcare Cost and Utilization Project (HCUP). Appendix A - Clinical Classification Software - Diagnoses. Revised 11/11/10 http://www.hcup-us.ahrq.gov/toolssoftware/ccs/AppendixASingleDX.txt
4. Agency for Healthcare Research and Quality 2011 Overview of the Kids' Inpatient Database (KID) http://www.hcup-us.ahrq.gov/kidoverview.jsp
5. Levels of Neonatal Care;American Academy of Pediatrics Committee on the Fetus and Newborn;Pediatrics,2012