One egg is best.
Ballantyne
Coco
C
D000328:Adult; D005260:Female; D005307:Fertilization in Vitro / Q000379:methods*; D006801:Humans; D009099:Multiple Birth Offspring; D011247:Pregnancy; D011256:Pregnancy Outcome; D012306:Risk; D014310:Triplets; D014427:Twins; D006113:United Kingdom