好像不少，看标准吧？这个是香港的

来源: 于 2010-06-17 06:20:49 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次
The prevalence was 16.1 per 10 000 for children less than 15 years old for the same period.

http://www.ncbi.nlm.nih.gov/pubmed/18160559