1. Department of Intensive Care Medicine, Huai'an Hongze District People's Hospital, Huai'an, P.R. China.
2. Department of Anesthesiology, The Second Affiliated Hospital of Xuzhou Medical University, Xuzhou, P.R. China.
3. Department of Pneumoconiosis, The Second Affiliated Hospital of Xuzhou Medical University, Xuzhou, P.R. China.
4. Department of Rehabilitation, Huai'an Hongze District Hospital of Traditional Chinese Medicine, Huai'an, P.R. China.