[1] Guangrao Hosp Tradit Chinese Med, Dept Gen Surg, Dongying, Shandong, Peoples R China
[2] Tianjin Fifth Cent Hosp, Outpatient & Emergency Preinspect Branch, Tianjin, Peoples R China
[3] Matern & Child Hlth Care Zaozhuang, Dept Hosp Infect Management, Zaozhuang, Shandong, Peoples R China
[4] Matern & Child Hlth Care Zaozhuang, Dept Pediat Surg, South Intersect Guangming Rd & Fuyuan 3rd Rd, Zaozhuang 277800, Shandong, Peoples R China
[5] Gucheng Cty Hosp, Dept Thorac Thyroid & Breast Surg, Hengshui, Hebei, Peoples R China