Lash TL, Johansen MB, Christensen S, Baron JA, Rothman KJ, Hansen JG, Sorensen HT. Hospitalization rates and survival associated with COPD: a nationwide Danish cohort study. Lung. 2011 Feb 1;189(1):27-35.
Espuga M, Munoz X, Plana E, Ramon MA, Morell F, Sunyer J. Prevalence of possible occupational asthma in hairdressers working in hair salons for women. Int Arch Allergy Immunol. 2011;154(4):379-88.