Risk score for failed trial of vaginal birth after a previous cesarean section including data of labor course - Machado Junior, Luis Carlos; Fama, Eduardo A. B; Zamboni, Jorge W; Awada, Pedro F; Araujo, Talitha A; Nascimento-ferreira, Marcus V; Carvalho, Heraclito Barbosa de (Journal of obstetrics and gynaecology research, 2020)