Ana Carla Sousa de Araujo, Érica Ferraz, Marcos de Carvalho Borges, João Terra Filho, Elcio Oliveira Vianna
Araujo ACS, Ferraz É, Borges MC, Terra Filho , Vianna EO. Investigation of factors associated with difficult-to-control asthma. J Bras Pneumol. 2007;33(5):495-501