Subtle progesterone rise in the single-dose gonadotropin-releasing hormone antagonist (cetrorelix) stimulation protocol in patients undergoing in vitro fertilization or intracytoplasmic sperm injection cycles. - Seow, Kok-Min; Lin, Yu-Hung; Huang, Lee-Win; Hsieh, Bih-Chwen; Huang, Shih-Chia; Chen, Chin-Yu; Chen, Pei-Hsin; Tzeng, Chii-Ruey; Hwang, Jiann-Loong (Gynecological Endocrinology, 2007)