DOI:
10.1055/s-00000036
Laryngo-Rhino-Otologie
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: 1887-1892
Search in:
Access:
Access:
We do not assume any responsibility for the contents of the web pages of other providers.