Effects of Vitamin B12 and Folic Acid Supplementation on Negative Symptoms as the Primary Outcome and Positive and Cognitive Symptoms as Secondary Outcomes in Schizophrenia: A Randomized Controlled Trial - Shah Ali, Mahnaz; Rezaei, Omid; Momeni Shideh, Reza; Sadighi, Gita (Iranian Journal of Psychiatry, 2026)