Small-scale variations in urban air pollution levels are significantly associated with premature births: a case study in São Paulo, Brazil - Saldiva, Silvia Regina Dias Medici; Barrozo, Ligia Vizeu; Leone, Clea Rodrigues; Failla, Marcelo Antunes; Bonilha, Eliana de Aquino; Bernal, Regina Tomie Ivata; Oliveira, Regiani Carvalho de; Saldiva, Paulo Hilário Nascimento (International journal of environmental research and public health, 2018)