Melendez-Torres, G J and Meiksin, Rebecca and Witzel, T Charles and Weatherburn, Peter and Falconer, Jane and Bonell, Chris (2022) eHealth interventions to address HIV and other sexually transmitted infections, sexual risk behavior, substance use, and mental ill-health in men who have sex with men: systematic review and meta-analysis. JMIR Public Health and Surveillance, 8, (4), e27061. doi: 10.2196/27061.

Witzel, T Charles (2020) Theory of change and logic model for an outreach programme for gay, bisexual and other men who have sex with men. Dublin: HSE Sexual Health & Crisis Pregnancy Programme.

Witzel, T Charles and Shanley, Adam and Weatherburn, Peter (2022) EMERGE report. Effect of COVID-19 and government restriction on the sexual health and well-being of gay and bisexual men in Ireland. Dublin: London School of Hygiene and Tropical Medicine ; MPower programme at HIV Ireland.