承上一問題，這有參考文章

請做以下連結
http://www.pitt.edu/~super1/lecture/lec9581/018.htm

http://scs.student.virginia.edu/7Ealphaed/pace/fall96/asthma.htm

http://www.ncbi.nlm.nih.gov/entrez/query.fcgicmd=Retrieve&db=PubMed&list_uids=12500044&dopt=Abstract

http://www.patienthealthinternational.com/conditionnews/cond4_item1972.aspx

http://www.healthyflooring.org/reports.html

http://www.epa.gov.tw/education/abc/2-43.html