[1] Weifang Med Univ, Affiliated Hosp, Weifang, Peoples R China
[2] SUNY Upstate Med Univ, Syracuse, NY 13210 USA
[3] Tsinghua Univ, Beijing Tsinghua Changgun Hosp, Beijing, Peoples R China
[4] Capital Med Univ, Fuxing Hosp, Beijing, Peoples R China
[5] Shandong Univ, Shandong Prov Hosp, Jinan, Shandong, Peoples R China