Is the natural twinning rate still declining?
Herskind
Anne Maria
AM
Basso
Olga
O
Olsen
Jørn
J
Skytthe
Axel
A
Christensen
Kaare
K
D000367:Age Factors; D015331:Cohort Studies; D003718:Denmark; D005260:Female; D005298:Fertility / Q000187:drug effects*; D005299:Fertility Agents / Q000008:administration & dosage; D006801:Humans; D007246:Infertility / Q000188:drug therapy; D011247:Pregnancy; D011272:Pregnancy, Multiple / Q000187:drug effects / Q000706:statistics & numerical data*; D012042:Registries; D027724:Reproductive Techniques, Assisted; D014427:Twins
D005299:Fertility Agents