Conservative treatment of cervico-isthmic heterotopic pregnancy by ine needle aspiration for selective embryo reduction. - Hsieh, Bih-Chwen; Seow, Kok-Min; Hwang, Jiann-Loung; Lin, Yu-Hung; Huang, Lee-Wen; Chen, Heng-Ju; Tzeng, Chii-Ruey (Reproductive BioMedicine Online (Reproductive Healthcare Limited), 2008)