[A global report on fertilization in vitro. Every fourth woman delivers twins].
Nygren
K G
KG
Fertiliseringscentrum, Carlanderska siukhemmet, Göteborg.
Wikland
M
M
D005260:Female; D005307:Fertilization in Vitro / Q000009:adverse effects*; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012307:Risk Factors; D014427:Twins