Original Article
Association of serum vitamin D levels with disease severity, systemic inflammation, prior lung function loss and exacerbations in a cohort of patients with chronic obstructive pulmonary disease (COPD)
Ilka Jorde, Sabine Stegemann-Koniszewski, Kristin Papra, Sebastian Föllner, Anke Lux, Jens Schreiber, Eva Lücke