Ballester, Laura Gili, Margalida Roca, Miquel Forteza-Rey, Inés Soto-Sanz, Victoria Vilagut, Gemma Amigo, Franco Moreno-Küstner, Berta Mortier, Philippe Piqueras, José A. Portillo-Van Diest, Ana Rebagliato, Marisa Rodríguez-Jiménez, Tíscar Alonso, Jordi Effectiveness of a guided mobile app intervention for depression and anxiety in university students (PROMES-U study): protocol of a multicenter randomized controlled trial BMC Public Health 10.1186/s12889-025-24752-3 2025 2025