1
Views
0
CrossRef citations to date
0
Altmetric
Letter to the Editor

Twinning rates: Reply

Page 1519 | Published online: 03 Aug 2009

References

  • Westin, B. Increased twinning rates in Norway. Acta Obstet Gynecol Scand. 2007:86;1407.
  • Timonen S, Carpen E. Multiple Pregnancies and photoperiodicity. Ann Chir Gynaecol Fenn. 1968; 57: 135–8
  • Timonen S, Franzas B, Wichmann K. Photosensibility of the human pituitary. Ann Chir Gynaecol Fenn. 1964; 53: 165–72
  • Timonen S, Lokki O, Wichmann K, Vara P. Seasonal changes in obstetrical phenomena. Acta Obstet Gynecol Scand. 1965; 44: 507–33

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.