[1] Brigham & Womens Hosp, Channing Lab, Boston, MA 02115 USA
[2] Brigham & Womens Hosp, Ctr Genom Med, Boston, MA 02115 USA
[3] Brigham & Womens Hosp, Div Pulm & Crit Care Med, Boston, MA 02115 USA
[4] Harvard Univ, Sch Med, Boston, MA USA
[5] Harvard Univ, Sch Publ Hlth, Dept Biostat, Boston, MA 02115 USA
[6] Boston Univ, Sch Med, VA Normat Aging Study, VA Healthcare Syst, Boston, MA 02118 USA
[7] Boston Univ, Sch Med, Dept Med, Boston, MA 02118 USA
[8] Lovelace Resp Res Inst, Albuquerque, NM USA
[9] Hosp Nacl Ninos Dr Carlos Saenz Herrera, Div Pediat Pulmonol, San Jose, Costa Rica
[10] Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden
[11] Karolinska Inst, Novum, Dept Biosci, S-10401 Stockholm, Sweden
[12] Karolinska Inst, Dept Publ Hlth Sci, S-10401 Stockholm, Sweden
[13] Karolinska Inst, Ctr Allergy Res, S-10401 Stockholm, Sweden
[14] Karolinska Univ Hosp, Astrid Lindgren Childrens Hosp, Stockholm, Sweden
[15] Karolinska Inst, Sachs Childrens Hosp, Stockholm, Sweden
[16] Univ Pittsburgh, Dept Med, Pittsburgh, PA USA