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Pattern-Mixture models
Molenberghs, Geert, (2004)
GEE with Gaussian Estimation of the Correlations When Data Are Incomplete
Lipsitz, Stuart R., (2000)
A Bivariate Pseudolikelihood for Incomplete Longitudinal Binary Data with Nonignorable Nonmonotone Missingness
Sinha, Sanjoy K., (2011)