1. Global Initiative for Asthma. NIH publication 02-3659, 2002.
2. British guideline on the management of asthma;Thorax,2003
3. Guidelines for the diagnosis and management of asthma,1997
4. The problem of asthma worldwide;Woolcock;Eur Respir Rev,1991
5. Clinical management of asthma in 1999: the asthma insights and realities in Europe (AIRE) study;Rabe;Eur Respir J,2000