Trends in the probability of twins and males in California, 1983-2003.

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Trends in the probability of twins and males in California, 1983-2003.

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2009 nî lūn-bûn

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2009年の論文

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2009年学术文章

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2009年学术文章

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2009年学术文章

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2009年学术文章

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2009年學術文章

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Trends in the probability of twins and males in California, 1983-2003.

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Trends in the probability of twins and males in California, 1983-2003.

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Trends in the probability of twins and males in California, 1983-2003.

@en

Trends in the probability of twins and males in California, 1983-2003.

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Trends in the probability of twins and males in California, 1983-2003.

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Trends in the probability of twins and males in California, 1983-2003.

@nl

P1476

Trends in the probability of twins and males in California, 1983-2003.

@en

P2093

Jill Hardin

http://www.w3.org/2001/XMLSchema#string

Steve Selvin

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P2860

Trends in the sex ratio of California births, 1960-1996

Influence of parental and biological factors on the male birth fraction in the United States: an analysis of birth certificate data from 1964 through 1988.

The paradox of declining fertility but increasing twinning rates with advancing maternal age.

Maternal reproductive and demographic characteristics as risk factors for hypospadias.

The rise in multiple births in the United States: who, what, when, where, and why.

Further evidence that mammalian sex ratios at birth are partially controlled by parental hormone levels around the time of conception.

The National Birth Defects Prevention Study.

Sex ratio in twin births.

The changing epidemiology of multiple births in the United States.

Multiple births: how are we doing?

P304

93-102

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P31

scholarly article

P356

10.1375/TWIN.12.1.93

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P407

English

P433

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P478

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P50

Suzan L Carmichael

Gary M Shaw

P577

2009-02-01T00:00:00Z

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P5875

24001333

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P698

19210184

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P921

California