| Study | Reason for exclusion |
|---|---|
| Cotton 1978 | Surgery was done after one week of birth for infants needing ventilation or Oxygen supplementation. Therefore, the intervention was not prophylactic. |
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.