A non-contact vital sign monitoring system for ambulances using dual-frequency microwave radars. - Satoshi Suzuki; Takemi Matsui; Hiroshi Kawahara; Hiroto Ichiki; Jun Shimizu; Yoko Kondo; Shinji Gotoh; Hirofumi Yura; Bonpei Takase; Masayuki Ishihara (Medical Biol. Eng. Comput., 2009)