1 Department of Psychoimmunology, National Institute of Psychiatry "Ramón de la Fuente", Calzada México-Xochimilco 101, Colonia San Lorenzo Huipulco, Tlalpan, 14370 Mexico City, DF, Mexico.
2 Research Group Immunophysiology, Institute of Physiology and Pathophysiology, Philipps University, 35037 Marburg, Germany.
3 Instituto de Inmunología, Facultad de Ciencias Médicas, Universidad Nacional de Rosario, Santa Fe 3100 CP, 2000 Rosario, Argentina.
4 Department of Pathology, National Institute of Medical Sciences and Nutrition "Salvador Zubirán", 14000 Mexico City, DF, Mexico.
5 Department of Pharmacology, School of Medicine, National Autonomous University of Mexico, P.O. Box 70-297, Coyoacan, 04510 Mexico City, DF, Mexico.
6 Department of Microbiology, Immunology, Virginia Commonwealth University, 1101 E. Marshal Street, Richmond, VA 232980678, USA.