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 of included studies in which 17 studies (14 conversational agents) were identified from 1513 articles in the initial database search (April 2017). Search updates were conducted until February 2018, with 3 new papers being identified for full-text screening.
