The proportion of patients with severe swallowing disorder decreased from 12, 1% at the beginning of treatment to 9, 1% after 5 days of treatment, after 10 days to 3% and after 15 days of treatment to 0%. By contract, the percentage of patients without swallowing disorder and mild swallowing disorder gradually increased from before treatment to after 5 days, 10 days and 15 days of treatment, with 33, 3% to 60, 6%, 81, 8% and 90, 9%, respectively.