Annesi-Maesano, I. Norback, D. Zielinski, J. Bernard, A. Gratziou, C. Sigsgaard, T. Sestini, P. Viegi, G., Geriatric study in Europe on health effects of air quality in nursing homes (GERIE study) profile: Objectives, study protocol and descriptive data, Multidisciplinary Respiratory Medicine, (8), 2013, BioMed Central Ltd., 1828-695X, 2049-6958