NCT03315195.

Study name	Preoperative oral nutritional supplement vs conventional dietary advice in major gastrointestinal surgery.
Methods	RCT.
Participants	268 adults undergoing major gastrointestinal surgery.
Interventions	Dietary advice versus oral nutritional supplement and dietary advice.
Outcomes	Postoperative complications.
Starting date	November 2017.
Contact information	Nattapanee Sukphol (nattapanee_benz@hotmail.com); Narongsak Rungsakulkji (narongsak.run@mahidol.ac.th).
Notes	Seems to meet the inclusion criteria for comparison 3 but needs full assessment following publication.