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Planned missing data designs in psychological research.
Graham JW, Taylor BJ, Olchowski AE, Cumsille PE. Graham JW, et al. Among authors: olchowski ae. Psychol Methods. 2006 Dec;11(4):323-43. doi: 10.1037/1082-989X.11.4.323. Psychol Methods. 2006. PMID: 17154750