New England Journal of Medicine
- Publisher
- Massachusetts Medical Society
- Website
- Periodicity
Articles
Concato, John, Shah, Nirav, Horwitz, Ralph I. (2000): Randomized, Controlled Trials, Observational Studies, and the Hierarchy of Research Design. In New England Journal of Medicine, 342 (25) pp. 1887-1892. https://www.nejm.org/doi/full/10.1056/NEJM200006223422507