Brock 1995.

Methods	Randomised controlled trial
Participants	21 patients who had undergone cardiac surgery
Interventions	1) 10% HES 200/0.5 in 7.2% saline (n = 7) 2) 5% HA (n = 7) 3) 6% HES in 0.9% saline (n = 7)
Outcomes	Death (data obtained on contact with study author) Haemodynamic variables
Notes	Data on allocation concealment was obtained on contact with the study authors
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	High risk	Inadequate. Allocation by list of random numbers read by someone entering patients into the trial (open list)