ECPPA: Randomised trial of low dose aspirin for the prevention of maternal and fetal complications in high risk pregnant women by Atallah, A, Collins, R, Farrell, B, Handoll, H, Freitas, A, Kinsui, L, Fukushima, O, Amorim, M, Eduardo, R, Durante, A, Vieira, C, Filho, J, Davolos, L, Zambotti, R, Negrao, C, Alves, O, Tobias, P, Freire, C, Almeida, C, Neto, J, Bertechini, L, Maest, I, Peracoli, J, Rudge, M, Silva, I