PT - JOURNAL ARTICLE AU - Eby, Don TI - Most important risk factor missing from COPD score AID - 10.1503/cmaj.71663 DP - 2019 Apr 01 TA - Canadian Medical Association Journal PG - E370--E370 VI - 191 IP - 13 4099 - http://www.cmaj.ca/content/191/13/E370.short 4100 - http://www.cmaj.ca/content/191/13/E370.full SO - CMAJ2019 Apr 01; 191