Figure 1.
Flow diagram of the bibliographic search results and the included articles through the title-abstract screening and full-text review. CAs, conversational agents; PDA, personal digital assistant—a type of handheld computer irrelevant to CA.
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.