Hill, K., Hodder, R., Blouin, M., Heels-Ansdell, D., Guyatt, G., & Goldstein, R. (2011). Identifying adults at risk of COPD who need confirmatory spirometry in primary care: Do symptom-based questions help? College of Family Physicians of Canada.

Hill, Kylie, Richard Hodder, Maria Blouin, Diane Heels-Ansdell, Gordon Guyatt, và Roger Goldstein. Identifying Adults At Risk of COPD Who Need Confirmatory Spirometry in Primary Care: Do Symptom-based Questions Help? College of Family Physicians of Canada, 2011.

Hill, Kylie, et al. Identifying Adults At Risk of COPD Who Need Confirmatory Spirometry in Primary Care: Do Symptom-based Questions Help? College of Family Physicians of Canada, 2011.