Effectiveness of the Elos 2.0 prevention programme for the reduction of problem behaviours and promotion of social skills in schoolchildren: study protocol for a cluster-randomized... von Mariano, Marília, da Silva, Anderson Ribeiro, Lima, Jacqueline L. S, de Pinho, Nícolas Tenedine, Cogo-Moreira, Hugo, Melo, Márcia H. S, Mari, Jair J, Sanchez, Zila M, Caetano, Sheila C

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