Reasons for this may be that results of clinical trials have more direct medical consequences than epidemiological studies and that regulatory ( ) control the conduct trials.
A.authorities B.proportions C.coauthors D.methodologies正确答案A
Reasons for this may be that results of clinical trials have more direct medical consequences than epidemiological studies and that regulatory ( ) control the conduct trials.
A.authorities B.proportions C.coauthors D.methodologies正确答案A
