Citation: Grov C, Stief M, Westmoreland DA, MacCrate C, Mirzayi C, Nash D; Together 5000 Study Team. Maximizing Response Rates to Ads for Free At-Home HIV Testing on a Men-for-Men Geosocial Sexual Networking App: Lessons Learned and Implications for Researchers and Providers. Health Educ Behav. 2020 Jan 3:1090198119893692. doi: 10.1177/1090198119893692. [Epub ahead of print]