SDNN index of heart rate variability as an indicator of change in rats exposed to fine particles: Study of the impact of air pollution in Mexico City. - Gabriel Vega-Martínez; Cinthya L. Toledo-Peral; Carlos Alvarado-Serrano; Lorenzo Leija Salas; Octavio Gamaliel Aztati-Aguilar; Andrea de Vizcaya-Ruiz (CCE, 2014)