Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Anuradha Roy,Estimating Correlation Coefficient between Two Variables with Repeated Observations using Mixed Effects Model,Biometrical Journal,0323-3847,Wiley,2006-04,48,2,286-301,https://cir.nii.ac.jp/crid/1360855571344667008,https://doi.org/10.1002/bimj.200510192