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Kerkhof, Marjan, Daryl Freeman, Rupert Jones, Alison Chisholm, ja David B. Price. "Predicting Frequent COPD Exacerbations Using Primary Care Data." Int J Chron Obstruct Pulmon Dis 2015.

Kerkhof, Marjan, et al. "Predicting Frequent COPD Exacerbations Using Primary Care Data." Int J Chron Obstruct Pulmon Dis 2015.