TY  - RPRT
TI  - Field-based random sampling without a sampling frame: control selection for a case-control study in rural Africa.
AU  - A C Crampin
AU  - V Mwinuka
AU  - S S Malema
AU  - J R Glynn
AU  - P E Fine
DO  - 10.1016/s0035-9203(01)90009-4
UR  - https://pubmed.ncbi.nlm.nih.gov/11706653/
ID  - 11706653
ER  -