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Monaco J, Cai J, Grizzle J.Monaco J, et al. Among authors: cai j.Stat Med. 2005 Nov 30;24(22):3387-400. doi: 10.1002/sim.2205.Stat Med. 2005.PMID: 16237657
Kim S, Cai J, Couper D.Kim S, et al. Among authors: cai j.Stat Med. 2016 Jan 30;35(2):282-93. doi: 10.1002/sim.6623. Epub 2015 Aug 26.Stat Med. 2016.PMID: 26310388Free PMC article.
Schaubel DE, Cai J.Schaubel DE, et al. Among authors: cai j.Stat Med. 2004 Jun 30;23(12):1885-900. doi: 10.1002/sim.1777.Stat Med. 2004.PMID: 15195322Free article.
Hu W, Cai J, Zeng D.Hu W, et al. Among authors: cai j.Stat Med. 2014 Oct 15;33(23):3973-85. doi: 10.1002/sim.6215. Epub 2014 Jun 2.Stat Med. 2014.PMID: 24889145Free PMC article.