@misc{indiciaefae0b3ca6648,
  title = {Multiple imputation methods for the missing covariates in generalized estimating equation.},
  author = {F Xie and M C Paik},
  year = {1997},
  url = {https://pubmed.ncbi.nlm.nih.gov/9423268/},
  note = {Source identifier: 9423268}
}