Miyakoshi, K. Otani, T. Kondoh, E. Makino, S. Tanaka, M. Takeda, S. Perinatal, Research Network Group in, Japan. Retrospective multicenter study of leaving the placenta in situ for patients with placenta previa on a cesarean scar. Int J Gynaecol Obstet. 2018. 140. 3. 345-351