[1] Boston Univ, Med Ctr, Ctr Pulm, Sch Publ Hlth, Boston, MA 02118 USA
[2] Boston Univ, Bioinformat Program, Boston, MA 02215 USA
[3] Lahey Clin Fdn, Dept Med, Div Pulm, Burlington, MA 01805 USA
[4] St James Hosp, Dublin 8, Ireland
[5] Trinity Coll Dublin, Dublin, Ireland
[6] Caritas St Elizabeths Med Ctr, Boston, MA 02135 USA
[7] Tufts Univ, Sch Med, Boston, MA 02135 USA
[8] Boston Univ, Dept Genet & Genom, Boston, MA 02118 USA