1. Faculty of Medicine and Nutrition, Juárez University of Durango State, Avenida Universidad, Durango, Dgo, Mexico.
2. Institute for Scientific Research, Juárez University of Durango State, Avenida Universidad, Durango, Dgo, Mexico.
3. Servicios de Salud de Durango, Independencia y Puebla, Canatlán, Durango, México.
4. Servicios de Salud de Durango, Madero esquina Baca Ortiz, Santiago Papasquiaro, Durango, México.
5. Institute for Microbiology and Hygiene, Campus Benjamin Franklin, Charité Medical School, Berlin, Germany.