Testing Theory-Enhanced Messaging to Promote COVID-19 Vaccination Among Adults: Randomized Controlled Trial. - Piltch-Loeb, Rachael; Shen, Yanhan; Fleary, Sasha; Robertson, McKaylee; Nuñez Sahr, Josefina; Penrose, Kate; Sanborn, Jenna; Yadav, Surabhi; Srivastava, Avantika; Nash, Denis; Parcesepe, Angela (Journal of Medical Internet Research, 2025)