Fig 1. Flowchart of cohort integration.
Serum EPO was measured in 1511 cases, of which 570 individual patients met inclusion criteria and were included in the study.
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.