Asthma and chronic obstructive pulmonary disease (COPD) prevalence and health services use in Ontario Metis: A population-based cohort study [PDF]Gershon, Andrea S., Khan, Saba, Klein-Geltink, Julie, Wilton, Drew, To, Teresa, Crighton, Eric J., . . . Henry, David A. (2014). Asthma and chronic obstructive pulmonary disease (COPD) prevalence and health services use in Ontario Métis: A population-based cohort study. PLoS ONE, 9(4), PLoS ONE, April, 2014, Vol.9(4).