1. Department of Colorectal Surgery, Tianjin Union Medical Center, Tianjin 300121, P.R. China
2. Department of Cardiology, The Fifth Affiliated Hospital of Sun Yan‑Sen University, Zhuhai, Guangdong 519000, P.R. China
3. Department of Nursing, Tianjin Union Medical Center, Tianjin 300121, P.R. China