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.
Comparison 1: Any opioid (e.g. morphine, diamorphine, fentanyl, alfentanil, sufentanil, pethidine, meperidine, codeine) compared to control (placebo or no intervention), with or without other nonâpharmacological measures, Outcome 14: Oxygen at 36 weeks' postmenstrual age (BPD moderate or severe)
