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.
View of the paper and digital versions of our case report form (CRF).
A. Representative view of the paper case report form on which data are collected.
B. Screen view of the digital data collection tool (Microsoft Access 2007). Shown is a representative page in the collection tool that corresponds to the common data elements (CDEs) collected in the case report form (part A).
