title: Author response to Liebergall.
authors: Norwegian School of Sport Sciences, Oslo, Norway.
authors: Kari
authors: K
authors: Bø
authors: Neuroscience Research Australia, Sydney, Australia.
authors: Rob
authors: R
authors: Herbert
mesh_terms: D005260:Female; D006801:Humans; D008168:Lung / Q000502:physiology*; D008297:Male; D026741:Physical Therapy Modalities; D004856:Postural Balance / Q000502:physiology*; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology* / Q000534:rehabilitation*