Surgical hard stops, elective sports medicine, outpatient / inpatient - guideline

American Diabetes Association: Preoperative A1C and Clinical Outcomes in Patients With Diabetes Undergoing Major Noncardiac Surgical Procedures Patricia Underwood1, Reza Askari2, Shelley Hurwitz1,3, Bindu Chamarthi1 and Rajesh Garg1 Diabetes Care 2014 Mar; 37(3): 611-616.

Effect of preoperative smoking cessation interventions on postoperative complications and smoking cessation T. Thomsen, H. Tønnesen, A. M. Møller First published: 08 April 2009

Reducing the Risks of Relief — The CDC's Opioid-Prescribing Guideline N Engl J Med. 2016 Apr 21; 374(16): 1501–1504. Thomas R. Frieden, M.D., M.P.H. and Debra Houry, M.D., M.P.H