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The many weak instruments problem and Mendelian randomization.
Davies NM, von Hinke Kessler Scholder S, Farbmacher H, Burgess S, Windmeijer F, Smith GD. Davies NM, et al. Among authors: farbmacher h. Stat Med. 2015 Feb 10;34(3):454-68. doi: 10.1002/sim.6358. Epub 2014 Nov 10. Stat Med. 2015. PMID: 25382280 Free PMC article.