Contribution of fetal deaths to the increase of preterm births in São Paulo State, Brazil - Almeida, Marcia Furquim de; Alencar, Gizelton Pereira; Ortiz Flores, Luis Patricio; Silva, Zilda Pereira da; Santos, P C dos; Raspantini, P. R (The 2012 International Conference on Stillbirth, SIDS and Infant survival, 2012)