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.
Strata used for subject randomization.
| Strata | Options |
| Gender | Male |
| Female | |
| Way of enrolment | ER (11 strata) |
| General practice | |
| Physical therapy office | |
| Worldwide web | |
| Health care utilisation | No treatment |
| Paramedical treatment | |
| Intramural medical treatment | |
| Extramural medical treatment |
