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A total of 37 chronic, severe, nonsmoking asthmatic patients with documented reversible airways obstruction were classified as glucocorticoid-sensitive or -resistant on the basis of changes in FEV1 , FVC , and peak expiratory flow ( PEF ) after oral prednisolone .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 None