TY  - GEN
AU  - Boerma, Jan Ties
AU  - Sommerfelt, A. Elisabeth
AU  - Rutstein, Shea O.
AU  - Rojas, Guillermo
ED  - Macro International. Institute for Resource Development . Demographic and Health Surveys.
TI  - Immunization : levels, trends and differentials
T2  - Demographic and health surveys comparative studies ; no.1
PY  - 1990///
CY  - Columbia, MD : 
PB  - Institute for Resource Development/Macro Systems
KW  - Immunization
KW  - In infancy and childhood
KW  - Statistics
KW  - Vaccination
KW  - Developing countries
ER  -