Can the results be explained by poor randomization and nonpertinent comparisons?
Blomberg
S
S
Ricksten
S E
SE
Olausson
K
K
Magnusdottir
H
H
Lurje
L
L
Wennerblom
B
B
Emanuelsson
H
H
D000767:Anesthesia, Epidural; D000789:Angina, Unstable / Q000628:therapy*; D003627:Data Interpretation, Statistical; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D018709:Statistics, Nonparametric