Studying the Digital Intervention Engagement–Mediated Relationship Between Intrapersonal Measures and Pre-Exposure Prophylaxis Adherence in Sexual and Gender Minority Youth: Secondary Analysis of a Randomized Controlled Trial. - Williams, Michael P; Manjourides, Justin; Smith, Louisa H; Rainer, Crissi B; Hightow-Weidman, Lisa B; Haley, Danielle F (Journal of Medical Internet Research, 2025)