Türkiye Maternal Fetal Tıp ve Perinatoloji Derneği :
The Fetus.Net :
ObGyn.Net :
American Congress of Obstetricians and Gynecologists :
Royal College of Obstetricians and Gynaecologists :
ACOG :
Medscape :
PUBMED :
PUDER :
The Fetal Medicine Foundation:
