Gaida, A.A.GaidaNell, C.C.NellHolz, O.O.HolzSchuchardt, S.S.SchuchardtKoczulla, R.R.KoczullaHohlfeld, J.J.Hohlfeld2022-03-062022-03-062015https://publica.fraunhofer.de/handle/publica/26003910.1183/13993003.congress-2015.PA2091en610616620Comparison of breath VOCs collected from controls, healthy smokers, smokers with COPD, and ex-smokers with COPD at two sitesjournal article