TY  - RPRT
TI  - Sampling strategies in nested case-control studies.
AU  - B Langholz
AU  - D Clayton
PY  - 1994
DO  - 10.1289/ehp.94102s847
UR  - https://pubmed.ncbi.nlm.nih.gov/7851330/
ID  - 7851330
ER  -