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.
Flow diagram. Depicts included and excluded patients, as well as numbers of patients available for each analysis. COVID-19, coronavirus disease 2019; RBP, retinol binding protein; UACR, urine albumin-creatinine ratio; UPCR, urine protein-creatinine ratio.
