1. Epidemiology and prevalence of chronic obstructive pulmonary disease;Diaz-Guzman;Clinics Chest Med.,2014
2. Global burden of COPD: systematic review and meta-analysis;Halbert;Eur. Respir. J.,2006
3. Respiratory health hazards in agriculture;Am. J. Respir. Crit. Care Med.,1998
4. Farmer's lung is now in decline;Arya;Ir. Med. J.,2006
5. Farmer's lung disease in Somerset;Pether;Br. J. Ind. Med.,1976