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Morbidity and Mortality Weekly Report. CDC surveillance summaries: MMWR
(Centers for Disease Control (CDC), 1991-12)
Morbidity and Mortality Weekly Report. CDC surveillance summaries: MMWR
(Centers for Disease Control (CDC), 1991-04)
Morbidity and Mortality Weekly Report. CDC surveillance summaries: MMWR
(Centers for Disease Control (CDC), 1991-07)
Morbidity and Mortality Weekly Report. CDC surveillance summaries: MMWR
(Centers for Disease Control (CDC), 1991-12)