TY  - RPRT
TI  - Annotation: what can be done about missing data? Approaches to imputation.
AU  - D F Heitjan
PY  - 1997
DO  - 10.2105/ajph.87.4.548
UR  - https://pubmed.ncbi.nlm.nih.gov/9146428/
ID  - 9146428
ER  -