Figure 2.

Study schema. Participants were randomized to either the chatbot or telephone contact intervention. Participants in the chatbot group who did not access the web portal by 12:00 AM the following day received a second contact attempt. Participants in the telephone group unavailable to speak on the phone received a second contact attempt. Participants in both groups who answered a contact attempt were asked to verify their identity by confirming their first and last name in addition to their birth date and to either update or confirm their contact information. Participants interested in learning more about the research study were either shown a pre-recorded video of a study overview within the chatbot web portal or presented the study overview script verbally by research coordinators. Participants in the chatbot and telephone groups who agreed to enroll in the study were invited to provide documentation of consent electronically. Once documentation of e-consent was obtained, participants in the chatbot group were invited to complete the questionnaire using a form within the chatbot web portal, whereas participants in the telephone group were asked to verbally complete the questionnaire administered by a call center agent.