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.
Experimental design. Week 3 was defined from 14 to 20 d, wk 4 from 21 to 27 d, wk 5 from 28 to 34 d, wk 6 from 35 to 41 d, wk 7 from 42 to 48 d, wk 8 from 49 to 55 d, wk 9 from 56 to 62 d, wk 10 from 63 to 69 d, wk 11 from 70 to 76 d, wk 12 from 77 to 83 d, wk 13 from 84 to 90 d and wk 14 from 91 to 96 days.
