Measurement of Placental Oxygenation by Transabdominal Near-Infrared Spectroscopy - Kawamura, Takakazu; Kakogawa, Jun; Takeuchi, Yasutaka; Takani, Satoko; Kimura, Satoshi; Nishiguchi, Tomizou; Sugimura, Motoi; Sumimoto, Kazuhiro; Kanayama, Naohiro (American Journal of Perinatology, 2007)