Description of the domains of the ERAS program for each included study.

1. Oral and written preadmission counseling and information.
2. Lack of routine preoperative bowel preparation.
3. Reduced fasting time plus carbohydrate loading.
4. Short-acting preanesthetic medication.
5. Prophylaxis against thromboembolism.
6. Antimicrobial prophylaxis.
7. Short-acting opioids/Epidural analgesia.
8. Prevention and treatment of postoperative nausea and vomiting.
9. Less invasive surgical incisions.
10. Prevention of intraoperative hypothermia.
11. Standardization of perioperative fluid management.
12. Judicious use of drains and catheters.
13. Prevention of postoperative ileus.
14. Postoperative nutritional care.
15. Early mobilization.