National and sub-national prevalence, trend, and burden of asthma in Iran from 1990 to 2013; the study protocol.

Background: $VWKPDLVDFKURQLFLQ?DPPDWRU\�DLUZD\�GLVHDVHFDXVHGRUZRUVHQ HGE\�HQYLURQPHQWDOIDFWRUVLQJHQHWLFDOO\�YXOQHUDEOH� people. The study of national and sub-national burden of asthma aims to provide a quantitative method and valid estimates for the preva- lence, incidence, and economic burden of asthma disease in Iran from 1990 to 2013 and this papers explains measures, data sources, methods, and challenges that we will use in the study. Methods: In order to conduct this study, we will use all available unpublished data sources, including claim databases and data collected