Ridha Rizki , Elmeida Effendy , Vita Camellia , Freddy Subastian 2020. CORRELATION BETWEEN POSITIVE AND NEGATIVE SYNDROME SCALE (PANSS) SCORES AND HOMOCYSTEINE LEVELS IN MEN WITH SCHIZOPHRENIA BATAKNESE TRIBE AT PSYCHIATRIC HOSPITAL OF PROF. M. ILDREM MEDAN. PalArch’s Journal of Archaeology of Egypt / Egyptology. 17, 6 (Nov. 2020), 1505 - 1518.