The burden of asthma in the United States: level and distribution are dependent on interpretation of the national asthma education and prevention program guidelines.
Fuhlbrigge AL, Adams RJ, Guilbert TW, Grant E, Lozano P, Janson SL, Martinez F, Weiss KB, Weiss ST. The burden of asthma in the United States: level and distribution are dependent on interpretation of the national asthma education and prevention program guidelines. Am J Respir Crit Care Med. 2002 Oct 15; 166(8):1044-9.