title: What's in this issue.
authors.forename: Mark L
authors.initials: ML
authors.lastname: Levy
mesh_terms: D001249:Asthma / Q000209:etiology; D006801:Humans; D015995:Prevalence; D029424:Pulmonary Disease, Chronic Obstructive / Q000453:epidemiology / Q000209:etiology* / Q000473:pathology / Q000503:physiopathology; D012307:Risk Factors; D012720:Severity of Illness Index; D012907:Smoking / Q000009:adverse effects* / Q000453:epidemiology