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Submitted on: 30 September 2000.
Revised on: 20 October 2000.
Accepted on: 06 November 2000.
___________________Journal of Asthma and Allergy---DOVE MEDICAL PRESS LTD
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Submitted on: 01 December 2010.
Revised on: 06 March 2011.
Accepted on: 28 March 2011.
___________________Journal of Asthma and Allergy---DOVE MEDICAL PRESS LTD
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