Thin endometrium problem in IVF programs.

Methods: Observational, comparative, prospective, multicenter study ( = 425). Group 1 ( = 228) received estradiol hemihydrate (Divigel, Orion Corporation, Finland), group 2 ( = 197) received oral estradiol valerate (Proginova, Delpharm Lille, France).

Results: An increase in endometrial thickness was comparable (10.