Miranda, M. J. de, Costa, C., Santana, P. and Barrozo, L. V. (2014) “Spatial association between socioeconomic variables and risk related to pre-term births in metropolitan region of Sao Paulo (MRSP) and Lisbon metropolitan area (AML)”, Saúde e Sociedade, 23(4), pp. 1142-1153. doi: 10.1590/S0104-12902014000400002.