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References for this PMC Article for PMID: 15695499

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The Danish National Birth Cohort--its background, structure and aim.
Olsen J, Melbye M, Olsen SF, Sørensen TI, Aaby P, Andersen AM, Taxbøl D, Hansen KD, Juhl M, Schow TB, Sørensen HT, Andresen J, Mortensen EL, Olesen AW, Søndergaard C. Olsen J, et al. Scand J Public Health. 2001 Dec;29(4):300-7. doi: 10.1177/14034948010290040201. Scand J Public Health. 2001. PMID: 11775787
Time to pregnancy and preterm delivery.
Henriksen TB, Baird DD, Olsen J, Hedegaard M, Secher NJ, Wilcox AJ. Henriksen TB, et al. Obstet Gynecol. 1997 Apr;89(4):594-9. doi: 10.1016/s0029-7844(97)00045-8. Obstet Gynecol. 1997. PMID: 9083319