International differences in cardiovascular clinical trials. Introduction.
O'Shea
J C
JC
Duke Clinical Research Institute, Durham, NC 27715, USA.
Califf
R M
RM
D002318:Cardiovascular Diseases / Q000628:therapy*; D002986:Clinical Trials as Topic / Q000379:methods / Q000592:standards; D006801:Humans; D007391:International Cooperation; D012107:Research Design / Q000592:standards*