TY  - RPRT
TI  - Multi-stage sampling in genetic epidemiology.
AU  - A S Whittemore
AU  - J Halpern
DO  - 10.1002/(sici)1097-0258(19970130)16:2<153::aid-sim477>3.0.co;2-7
UR  - https://pubmed.ncbi.nlm.nih.gov/9004389/
ID  - 9004389
ER  -