Diagnostic value of transvaginal three-dimensional ultrasound combined with color Doppler ultrasound for early cesarean scar pregnancy - Shi, Liangyan; Huang, Lijuan; Liu, Lu; Yang, Xiaohong; Yao, Dongmei; Chen, Dejun; Xiong, Jun; Duan, Jie (Annals of Palliative Medicine, 2021)