1 Department of Psychoimmunology, National Institute of Psychiatry "Ramón de la Fuente", Calzada México-Xochimilco 101, Colonia San Lorenzo Huipulco, Tlalpan, 14370 Mexico City, Mexico.
2 Research Group Immunophysiology, Institute of Physiology and Pathophysiology, Philipps University, 35037 Marburg, Germany.
3 Instituto de Inmunología Clínica y Experimental, CONICET-Universidad Nacional de Rosario, Suipacha 590 CP, 2000 Rosario, Argentina.
4 School of Medicine, National Autonomous University of Mexico, Avenida Universidad 3000, Coyoacan, 04510 Mexico City, Mexico.
5 Institute of Biomedical Research, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Avenida Ipiranga, No. 6690, 90610-900 Porto Alegre, RS, Brazil.