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Respiratory Research > 2012 > 13 > 1 > 1-8
Multidisciplinary Respiratory Medicine > 2010 > 5 > 2 > 1-8
Journal of Clinical Epidemiology > 1997 > 50 > 4 > 463-473
Respiratory Research > 2012 > 13 > 1 > 1-8
Multidisciplinary Respiratory Medicine > 2010 > 5 > 2 > 1-8
Journal of Clinical Epidemiology > 1997 > 50 > 4 > 463-473