Elbers 1997.

Methods	Randomised clinical trial, Germany.
Participants	20 hospitalised adults undergoing curative resection of gastric cancer, at nutritional risk due to major surgery Male:female = 11:9 Mean age = 64 years
Interventions	Experimental group: oral supplement with a proteinful, liquid sip feed (3 x 200 ml, 600 kcal/day, 54 g protein/day) starting on day 5 after surgery(n = 10) Control group: no intervention(n = 10) Co‐intervention: standard diet and parenteral nutrition until day 5
Outcomes	Plasma proteins, nitrogen balance
Study dates	Not stated
Notes	We found no contact information for the author.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not described
Allocation concealment (selection bias)	Unclear risk	Not described
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not described
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not described
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	The number of participants with incomplete data was not reported.
Selective reporting (reporting bias)	Unclear risk	No protocol could be obtained and the trial did not report mortality.
For‐profit bias	Unclear risk	The trial was supported by a company that might have an interest in a given result (Fresemius AG).
Other bias	Low risk	The trial appeared to be free of other components that could put it at risk of bias.