作者单位:Fourth Mil Med Univ, Dept Biomed Engn, 169 Changle West Rd, Xian 710032, Shaanxi, Peoples R China[1]Bethune Int Peace Hosp, Dept Biomed Engn, Shijiazhuang 050082, Hebei, Peoples R China[2]Fourth Mil Med Univ, Dept Endocrinol, Xijing Hosp, Xian 710032, Shaanxi, Peoples R China[3]