Drug Polyconsumption is associated with increased Synchronization of Brain Electrical-Activity at REST and in a Counting Task. - R. Coullaut-Valera; I. Arbaiza; Ricardo Bajo; R. Arrúe; María Eugenia López; J. Coullaut-Valera; A. Correas; David López-Sanz; Fernando Maestú; David Papo (Int. J. Neural Syst., 2014)