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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.
(A) Patients younger than 65 years in period A (February to April). (B) Patients younger than 65 years in period B (May to July). (C) Patients older than 65 years in period A. (D) Patients older than 65 years in period B.
