Summary References
Treatments:
1. http://www.peakflow.com/top_nav/normal_values/index.html
2. http://annhyg.oxfordjournals.org/content/51/3/327.full
3.http://books.google.com/books?id=Pv-AO-ESozgC&pg=PA497&lpg=PA497&dq=normal+pifr&source=bl&ots=bxm0rYsh1H&sig=zw3hzXJ33AYYHYH2FSxsm3ofLQ0&hl=en&ei=mFOQTMrJCsPCceea4PMM&sa=X&oi=book_result&ct=result&resnum=8&ved=0CDoQ6AEwBzgK#v=onepage&q=normal pifr&f=false
4. http://erj.ersjournals.com/content/18/5/780.full
5. http://homepages.cae.wisc.edu/~bme200/flow_meter_fall05/reports/Midsemester_Report.pdf
6. http://www.suite101.com/content/are-you-inhaling-your-medicine-completely-a115343
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