1. Planning performance in schizophrenia patients: a meta-analysis of the influence of task difficulty and clinical and sociodemographic variables. Issue 11 (7th April 2017) Authors: Knapp, F.; Viechtbauer, W.; Leonhart, R.; Nitschke, K.; Kaller, C. P. Journal: Psychological medicine Issue: Volume 47:Issue 11(2017) Page Start: 2002 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗