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[PubMed] [Google Scholar] 71.Kosmider L, Sobczak A, Prokopowicz A, Kurek J, Zaciera M, Knysak J, Smith D, Goniewicz ML

N Engl J Med 371: 932943, 2014

Check your bags three times before you pack

Drinking and smoking together is strongly socially patterned[4], being normative behaviour in pubs, bars and clubs worldwide until the recent introduction in some countries of smoking restrictions in public places[5]

receive any breastmilk at six months, and only a quarter (24.9%) are exclusively breastfed until six months [5]

Thus, the COPD diagnosis was based on administrative data rather than clinical diagnosis using spirometry, which may have resulted in misclassification bias