[1] China Med Univ, Affiliated Hosp 1, Dept Gen Practice, 155 Nanjing North St, Shenyang 110001, Peoples R China
[2] China Med Univ, Affiliated Hosp 4, Dept Gen Surg 4, 4 Chongshan East Rd, Shenyang 110032, Peoples R China
[3] China Med Univ, Dept Sci, 77 Puhe Rd, Shenyang 110122, Peoples R China
[4] China Med Univ, Expt Ctr, 77 Puhe Rd, Shenyang 110122, Peoples R China