title: It's about numbers, not pictures.
authors.affiliation: Department of Medicine, University of California, San Diego, California.
authors.forename: G Kim
authors.initials: GK
authors.lastname: Prisk
authors.forename: Rui Carlos
authors.initials: RC
authors.lastname: Sá
mesh_terms: D005260:Female; D006371:Helium / Q000032:analysis*; D006801:Humans; D008168:Lung / Q000502:physiology*; D008297:Male; D012123:Pulmonary Ventilation / Q000502:physiology*
chemical_list: D006371:Helium