1. Pediatric Surgery, 7th Edition;JL Grosfeld,2012
2. Rates and patterns of death after surgery in the United States, 1996 and 2006;ME Semel;Surgery,2012
3. American College of Surgeons, https://www.facs.org/quality%20programs/pediatric/overview, [accessed 26.14.2016]
4. Development and evaluation of the American College of Surgeons NSQIP Pediatric surgical risk calculator;K Kraemer;J Am Coll Surg,2016
5. Optimal resources for Children’s Surgical Care 2015 Manual, American College of Surgeons, 2015.