Mobile App Strategy to Facilitate Human Papillomavirus Vaccination Among Young Men Who Have Sex With Men: Pilot Intervention Study.

Background: Mobile app-based interventions have been identified as potential facilitators for vaccination among young men who have sex with men (MSM).

Objective: This pilot study aimed to test the feasibility of a theoretically informed mobile health (mHealth) tool designed to reduce health disparities and facilitate human papillomavirus (HPV) vaccination among a sample of young MSM.

Methods: The development of the mHealth tool was guided by previous research, implementation intention theory, and design thinking.