11561
METHODS: During a double-blind placebo-controlled crossover study , 200 micrograms fluticasone propionate aqueous nasal spray (in the active treatment period ) and placebo (in the placebo treatment period ) were administered twice daily for 2 weeks to 22 patients allergic to house dust mite .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 None