TY  - GEN
TI  - Second twin
SN  - 0007-1447
PY  - 1968///0816
KW  - Birth Order
KW  - Birth Weight
KW  - Female
KW  - Humans
KW  - Infant Mortality
KW  - Infant, Newborn
KW  - Male
KW  - Pregnancy
KW  - Twins
N1  - Publication Type: Journal Article
ER  -