1. Department of Nursing, Mudanjiang Medical University of Affiliated HongQi Hospital, Mudanjiang, Heilongjiang 157000, P.R. China
2. Emergency Internal Medicine, Mudanjiang Medical University of Affiliated HongQi Hospital, Mudanjiang, Heilongjiang 157000, P.R. China
3. Department of Ophthalmology, Mudanjiang Medical University of Affiliated HongQi Hospital, Mudanjiang, Heilongjiang 157000, P.R. China