Limits to causal inference based on Mendelian randomization: a comparison with randomized controlled trials.
Nitsch D; Molokhia M; Smeeth L; DeStavola BL; Whittaker JC; Leon DA; American Journal of Epidemiology, 2006, vol. 163, issue 5, p 397, ISSN 00029262. ISBN 00029262.

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