TY  - GEN
AU  - Imaizumi,Y
AU  - Inouye,E
TI  - Analysis of multiple birth rates in Japan. 1. Secular trend, maternal age effect, and geographical variation in twinning rates
SN  - 0001-5660
PY  - 1980///0825
KW  - Adult
KW  - Birth Rate
KW  - Demography
KW  - Female
KW  - Humans
KW  - Japan
KW  - Male
KW  - Maternal Age
KW  - Middle Aged
KW  - Pregnancy
KW  - Triplets
KW  - Twins
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1017/s0001566000009144
ER  -