TY  - JOUR
A1  - Y.B., Cheung
A1  - Yip, P.
A1  - Karlberg, J.
T1  - Mortality of twins and singletons by gestational age: A varying-coefficient approach
Y1  - 2000
DO  - 10.1093/aje/152.12.1107
VL  - 152
IS  - 12

ER  -