P199 Effects of prefrontal cathodal tDCS on brain glutamate levels and resting state connectivity: A randomized, sham-controlled, cross-over trial in healthy volunteers. Issue 4 (April 2020) - Mezger, E.; Rauchmann, B.S.; Brunoni, A.R.; Bulubas, L.; Thielscher, A.; Werle, J.; Mortazavi, M.; Karali, T.; Stöcklein, S.; Ertl-Wagner, B.; Goerigk, S.; Padberg, F.; et al.