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Continue to ChatSpecification of Variance Covariance Structure in Bivariate Mixed Model for Unequally Time Spaced Longitudinal Data - https://avesis.hacettepe.edu.tr/publication/details/fc62ace4-7b56-491b-b8aa-c23f0251bb91/specification-of-variance-covariance-structure-in-bivariate-mixed-model-for-unequally-time-spaced-longitudinal-data