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.
| Study ID | Reason for exclusion |
| Becker 1980 | Outcomes not validated |
| Cooper 1989 | Qualitative report |
| Dickinson 1995 | Setting |
| Hewawasam 1996 | Study design |
| Hussian 1987 | Study design |
| Jacobs 1974 | Participants |
| Knobel 1985 | Descriptive article |
| Namazi 1989 | Study design |
| Rabin 1981 | Descriptive article |
| Rice 1980 | Outcomes |
| Steer 1975 | Counfounding |
| Steffes 1985 | Staffing confound |
