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.
(×4) (A–F) and (×10) (H–M), and (A), (C), (E) is control groups of first, second and fourth pregnancy, respectively. (B), (D), (F) is exposure groups of first, second and fourth pregnancy, respectively. (H–M) is the high power field of the designated area of (A–F), respectively.
