Clinical trials: introduction.
Held
P
P
Section of Preventive Cardiology, The Cardiovascular Institute, Göteborg University, Göteborg, Sweden.
Wedel
H
H
Wilhelmsen
L
L
D002986:Clinical Trials as Topic; D019317:Evidence-Based Medicine; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012106:Research