[1] Boston Med Ctr, Rheumatol, Boston, MA USA
[2] Boston Univ, Sch Med, Ctr Pulm, Sarcoidosis Ctr, Boston, MA 02118 USA
[3] Boston Univ, Sch Med, Clin Epidemiol Res & Training Unit, Boston, MA 02118 USA
[4] Boston Univ, Boston, MA 02215 USA
[5] Boston Univ, Sch Med, Div Hematol & Oncol, Boston, MA 02118 USA
[6] Boston Univ, Rheumatol, Boston, MA 02215 USA