1. Surgical Recall;Blackbourne,1994
2. Investigating the “Rule of W,” a mnemonic for teaching on postoperative complications;Hyder;J Surg Educ,2015
3. Wind, water, wound, walk–do the data deliver the dictum?;Sonnenberg;J Surg Educ,2015
4. American College of Surgeons- National Surgical Quality Improvement Program. ACS- NSQIP user guide for the 2016 Participant data use file.
5. Chapter 4: ACS NSQIP Variables and Definitions. ACS NSQIP Operations Manual 2016.