Supplemental material, sj-pdf-1-jop-10.1177_0269881120965937 for Efficacy of N-methyl-D-aspartate receptor modulator augmentation in schizophrenia: A meta-analysis of randomised, placebo-controlled trials by Kah Kheng Goh, Tzu-Hua Wu, Chun-Hsin Chen and Mong-Liang Lu in Journal of Psychopharmacology