Crampin, AC; Mwinuka, V; Malema, SS; Glynn, JR; Fine, PE; (2001) Field-based random sampling without a sampling frame: control selection for a case-control study in rural Africa. Transactions of the Royal Society of Tropical Medicine and Hygiene, 95 (5). pp. 481-3. ISSN 0035-9203 https://researchonline.lshtm.ac.uk/id/eprint/16282 Full text not available from this repository.