Noninvasive measurement of total hemoglobin and hemoglobin derivatives using multiwavelength pulse spectrophotometry -In vitro study with a mock circulatory system. - Hironori Suzaki; Naoki Kobayashi; Takashi Nagaoka; Kiyotaka Iwasaki; Mitsuo Umezu; Sunao Takeda; Tatsuo Togawa (EMBC, 2006)