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We would like to thank Manuel Arrayas, Ori Ganor and Nilanjan Sircar for useful comments and discussions. H. Nastase is grateful for the hospitality of the Department of Physics at Tel Aviv University, during the final stages of this work. This work was supported in part by a center of excellence supported by the Israel Science Foundation (grant No. 1989/14), and by the US-Israel bi-national fund (BSF) grant No. 2012383 and the Germany Israel bi-national fund GIF grant No. I-244-303.7-2013. The work of H. Nastase is supported in part by CNPq grant 304006/2016-5 and FAPESP grant 2014/18634-9. H. Nastase would also like to thank the ICTP-SAIFR for their support through FAPESP grant 2016/01343-7. C. Hoyos is supported by the Ramon y Cajal fellowship RYC-2012-10370, the Asturian grant FC-15-GRUPIN14-108 and the Spanish national grant MINECO-16-FPA2015-63667-P. D. W. F. Alves is supported by CNPq grant 146086/2015-5.