25-hydroxyvitamin D deficiency, exacerbation frequency and human rhinovirus exacerbations in chronic obstructive pulmonary diseaseJennifer K Quint(Roland Hill (United Kingdom)), Jadwiga A. Wedzicha(Roland Hill (United Kingdom))BMC Pulmonary MedicineJune 22, 201210.1186/1471-2466-12-28Cited by 50SaveCiteExport RISWatch citationsRelated PapersEffect of Interactions Between Lower Airway Bacterial and Rhinoviral Infection in Exacerbations of COPD|CHEST Journal|2006|315