title: Risk indexes for exacerbations due to COPD: need to validate using broader criteria.
authors: Anant
authors: A
authors: Mohan
authors: Surya Prakash
authors: SP
authors: Bhatt
authors: Randeep
authors: R
authors: Guleria
mesh_terms: D000553:Ambulatory Care / Q000592:standards*; D015897:Comorbidity; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000453:epidemiology / Q000628:therapy*; D012008:Recurrence; D015203:Reproducibility of Results; D018570:Risk Assessment; D012307:Risk Factors