Chlorine isotopic composition of perchlorate in human urine as a means of distinguishing among exposure sources. Armen Poghosyan3, Maria Morel-Espinosa, Liza Valentin-Blasini, Benjamin C Blount, Catterina Ferreccio, Craig M Steinmaus and Neil C Sturchio Journal of Exposure Science and Environmental Epidemiology Año 2015 Volumen 2015 Paginas 1-5