Experimental: the observation group

Assigned randomly before the treatment, all patients were provided with comprehensive rehabilitation therapy as follows:~Basic treatment, including corresponding control of risk factors and education on healthy lifestyles.~Swallowing training, including lemon ice stimulation, mendelson maneuver, empty swallowing training, and pronunciation training.~Pulmonary function training, including standing training, cough training, and diaphragm muscle training.~The observation group was given enteral nutritional support with Intermittent Oro-esophageal Tube according to the following procedure. The feeding content was formulated by the nutritionists based on the condition and relevant guidelines to reach the energy demand as 20-25 kcal/kg/day and protein supplementation of 1.2-2.0 g/kg/day for both two groups

Active_comparator: the control group

Assigned randomly before the treatment, all patients were provided with comprehensive rehabilitation therapy as follows:~Basic treatment, including corresponding control of risk factors and education on healthy lifestyles.~Swallowing training, including lemon ice stimulation, mendelson maneuver, empty swallowing training, and pronunciation training.~Pulmonary function training, including standing training, cough training, and diaphragm muscle training.~Besides, the control group was given enteral nutritional support with Nasogastric Tube according to the relevant guidelines. Within 4 hours after admission, the placement of the feeding tube was conducted by professional medical staffs and after intubation, the tube was secured to the cheek with medical tape. The feeding was conducted once every 3-4 hours, with 200-300ml each time. The total feeding volume was determined based on daily requirements.