作者单位:Mayo Clin, Dept Radiol, Rochester, MN USA[1]Mayo Clin, Div Rheumatol, Rochester, MN USA[2]Univ Milano Bicocca, Clin Pneumol, AO San Gerardo, Dept Hlth Sci, Monza, Italy[3]Mayo Clin, Div Pulm & Crit Care Med, 200 First St SW, Rochester, MN 55905 USA[4]