Arby Shafara Sekundaputra, Rahmawati. KETAMINE VERSUS ELECTROCONVULSIVE THERAPY FOR SEVERE TREATMENT-RESISTANT DEPRESSION: A SYSTEMATIC REVIEW AND META-ANALYSIS OF EFFICACY, SPEED OF RESPONSE, COGNITIVE OUTCOMES, AND SAFETY. the int. j. of med. science and health. 2026;49(2):62-146. doi:10.70070/fdkn3z10