[1] BWH, Channing Lab, Boston, MA USA
[2] Cornell Univ, Ithaca, NY USA
[3] Univ Minnesota, Minneapolis, MN USA
[4] Northwestern Univ, Asthma & COPD Program, Chicago, IL 60611 USA
[5] Columbia Univ, New York, NY USA
[6] Albert Einstein Coll Med, Bronx, NY 10467 USA
[7] Univ Pittsburgh, Pittsburgh, PA USA
[8] Boston Univ, Sch Med, Pulm Ctr, Boston, MA 02118 USA
[9] Univ Alabama Birmingham, Birmingham, AL USA
[10] Birmingham VA Med Ctr, Birmingham, AL USA
[11] Tougaloo Coll, Jackson, MS USA
[12] Dept Med, Div Gen Med, New York, NY USA