title: [Pulmonary involvement in progressive systemic sclerosis--measurement of distribution of ventilation-perfusion ratios with xenon-133].
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D012595:Scleroderma, Systemic / Q000503:physiopathology*; D014692:Ventilation-Perfusion Ratio