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.
PRISMA diagram of eligible studies.
ASCO, American Society of Clinical Oncology; ESMO, European Society for Medical Oncology; WCLC, World Conference on Lung Cancer.
aPrimary or associated reports of eligible studies that were not identified through database search.
