Potencial health impact of ultrafine particles under clean and polluted urban atmospheric conditions: a model-based study - Martins, Leila Doprinchinski; Martins, Jorge A; Freitas, Edmilson Dias de; Mazzoli, Caroline R; Gonçalves, Fábio Luiz Teixeira; Ynoue, Rita Y; Hallak, Ricardo; Albuquerque, Taciana Toledo A; Andrade, Maria de Fátima (Air Quality Atmosphere and Health, 2010)