DOI:
10.1055/s-00000022
Das Gesundheitswesen
LinksClose Window
References
Concato J, Shah N, Horwitz RI.
Randomized, controlled trials, observational studies, and the hierarchy of research designs.
N Engl J Med 2000;
342 (25) 1887-1892
Search in:
Access:
Access:
We do not assume any responsibility for the contents of the web pages of other providers.