Real-World Effectiveness and Safety of Esketamine Nasal Spray in Treatment-Resistant Depression: A Retrospective Observational Study - Mostafa A. Sayed Ali; Palanisamy Amirthalingam; Hanan Alshareef; Mohammed Zayed Alassiry; Ahmed Samir Elshenawy; Sayed Hosam Eldin Mansour; Ahmed Aljabri (Healthcare, 2026)