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Siebeling, L; Puhan, M A; Muggensturm, P; Zoller, M; Ter Riet, G (2011). Characteristics of Dutch and Swiss primary care COPD patients - baseline data of the ICE COLD ERIC study. Clinical Epidemiology, 3(1):273-283.
Siebeling, L; ter Riet, G; van der Wal, W M; Geskus, R B; Zoller, M; Muggensturm, P; Joleska, I; Puhan, M A (2009). ICE COLD ERIC--International collaborative effort on chronic obstructive lung disease: exacerbation risk index cohorts--study protocol for an international COPD cohort study. BMC Pulmonary Medicine, 9:15.