Medicine
Laparotomy
MEDLINE
Vascular surgery
Intensive care medicine
CINAHL
Randomized controlled trial
Abdominal surgery
Evidence-based medicine
Guideline
Delphi method
Cardiothoracic surgery
Elective surgery
Perioperative
Systematic review
Population
General surgery
Cardiac surgery
Surgery
Nursing
Alternative medicine
Psychological intervention
Statistics
Mathematics
Pathology
Environmental health
Political science
Law