The most interesting studies are those that don't turn out the way you expected.
de Ziegler
D
D
D005260:Female; D005307:Fertilization in Vitro / Q000379:methods*; D005782:Gels / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D011247:Pregnancy; D018873:Pregnancy Rate; D011374:Progesterone / Q000031:analogs & derivatives* / Q000627:therapeutic use; D012107:Research Design; D012189:Retrospective Studies
C400424:Crinone; D005782:Gels; D011374:Progesterone