A review of low-level air pollution and adverse effects on human health: implications for epidemiological studies and public policy - Olmo, Neide Regina Simões; Braga, Alfésio Luís Ferreira; Lin, Chin An; Santos, Ubiratan de Paula; Saldiva, Paulo Hilário Nascimento; Pereira, Luiz Alberto Amador (Clinics, 2011)