1. Department of Pediatrics, Daqing Longnan Hospital, Daqing, Heilongjiang 163453, P.R. China
2. Department of Anesthesiology, Daqing Longnan Hospital, Daqing, Heilongjiang 163453, P.R. China
3. General Practice, Longgang Street Longnan Community Health Service Center, Daqing, Heilongjiang 163453, P.R. China
4. Department of Rehabilitation, Daqing Longnan Hospital, Daqing, Heilongjiang 163453, P.R. China