Time to pregnancy and sex of offspring: cohort study.
Smits
Luc J M
LJ
Maastricht University, Department of Epidemiology, PO Box 616, 6200 MD Maastricht, Netherlands. luc.smits@epid.unimaas.nl
de Bie
Rob A
RA
Essed
Gerard G
GG
van den Brandt
Piet A
PA
D000328:Adult; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D009426:Netherlands; D011247:Pregnancy / Q000706:statistics & numerical data*; D012744:Sex Ratio; D013997:Time Factors