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R. Ewert, S. Gläser, J. Winkler, H. Schrader, B. G.Trümper, P.-U. Haase, A. Obst, G. Hoheisel. "Spiroergometrie bei Patienten mit chronisch obstruktiver Lungenerkrankung - multizentrischer Vergleich von zwei Belastungsprotokollen." Pneumologie 66.07 (2012) 402-407