1. Department of Respiratory Diseases, The Affiliated Huai'an Hospital of Xuzhou Medical University, Huai'an, Jiangsu 223002, P.R. China
2. Department of Ear‑Nose‑Throat, The Affiliated Huai'an Hospital of Xuzhou Medical University, Huai'an, Jiangsu 223002, P.R. China
3. Institute of Medicinal Biotechnology, Jiangsu College of Nursing, Huai'an, Jiangsu 223300, P.R. China