Pentoxifylline as an adjunctive in treatment of negative symptoms in chronic schizophrenia: A double-blind, randomized, placebo-controlled trial. - Abdallah MS; Mosalam EM; Hassan A; Ramadan AN; Omara-Reda H; Zidan AA; Samman WA; El-Berri EI (CNS neuroscience & therapeutics, 2023)