Where are randomized trials necessary: Are smoking and parachutes good counterexamples?

Corresponding Author

Vinay Prasad

Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California, USA

Correspondence

Vinay Prasad, Department of Epidemiology and Biostatistics, University of California San Francisco, 550 16th St, 2nd Fl, San Francisco, CA 94158, USA.

Email: vinayak.prasad@ucsf.edu

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