Cited 4 times since 2008 (0.2 per year) source: EuropePMC Radiology, Volume 247, Issue 1, 1 1 2008, Pages 293-4; author reply 294 Can the extent of low-attenuation areas on CT scans really demonstrate changes in the severity of emphysema? Stoel BC, Parr DG, Bakker EM, Putter H, Stolk J, Gietema HA, Schilham AM, van Ginneken B, van Klaveren RJ, Lammers JW, Prokop M