1. Nursing Department, Cangzhou Central Hospital, Cangzhou, Hebei, China (mainland)
2. Department of Cardiology, Cangzhou Central Hospital, Cangzhou, Hebei, China (mainland)
3. Department of Nephrology, Cangzhou Central Hospital, Cangzhou, Hebei, China (mainland)
4. Department of Pathology, Cangzhou Central Hospital, Cangzhou, Hebei, China (mainland)