| Date | Event | Description |
|---|---|---|
| 20 February 2011 | Amended | Changed subgroup analysis. Early embryo transfers are up to day 3, late transfers are from day 4 onwards. |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.