TY  - BOOK
AU  - Lwanga, S K
AU  - Lemeshow, S
ED  - Who
ED  - World Health Organization
TI  - Sample size determination in health studies:  a practical manual
SN  - 9241544058
PY  - 1991///
PB  - WHO
KW  - Sampling
KW  - Surveys
KW  - Health
KW  - Statistical method
KW  - Index
ER  -