ACKNOWLEDGMENTS
We appreciate Feifei Cao from
Beijing Tongren Hospital for her contribution in the SPT and sera
detection by UniCAP. We would like to thank Ming Wang and Bing Yan from
Beijing Key Laboratory of Nasal Diseases
for
their comments on this manuscirpt. All the subjects are acknowledged for
their participation in our survey. This study was supported by the
special talent program of Hebei Province (Grant No. 070006-702800116049,
070006-702800117003).