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Song X, Davidian M, Tsiatis AA.Song X, et al. Among authors: davidian m.Biometrics. 2002 Dec;58(4):742-53. doi: 10.1111/j.0006-341x.2002.00742.x.Biometrics. 2002.PMID: 12495128
Song X, Davidian M, Tsiatis AA.Song X, et al. Among authors: davidian m.Biostatistics. 2002 Dec;3(4):511-28. doi: 10.1093/biostatistics/3.4.511.Biostatistics. 2002.PMID: 12933595
Tsiatis AA, Davidian M, Zhang M, Lu X.Tsiatis AA, et al. Among authors: davidian m.Stat Med. 2008 Oct 15;27(23):4658-77. doi: 10.1002/sim.3113.Stat Med. 2008.PMID: 17960577Free PMC article.
Zhang M, Tsiatis AA, Davidian M.Zhang M, et al. Among authors: davidian m.Biometrics. 2008 Sep;64(3):707-715. doi: 10.1111/j.1541-0420.2007.00976.x. Epub 2008 Jan 11.Biometrics. 2008.PMID: 18190618Free PMC article.