[1] Univ Illinois, Pulm Crit Care Sleep & Allergy, Chicago, IL USA
[2] Univ Calif San Francisco, Dept Med, San Francisco, CA USA
[3] Univ Calif Berkeley, Sch Publ Hlth, Div Environm Hlth Sci, Berkeley, CA 94720 USA
[4] Mayo Clin, Div Prevent Occupat & Aerosp Med, Rochester, MN USA
[5] Mayo Clin, Div Pulm & Crit Care Med, Rochester, MN USA
[6] Imperial Coll London, Natl Heart & Lung Inst, London, England
[7] Yonsei Univ, Dept Pathol, Wonju Colleage Med, Seoul, South Korea
[8] Univ Liverpool Liverpool Sch Trop Med, Liverpool, Merseyside, England
[9] Natl Inst Resp Dis, Mexico City, DF, Mexico
[10] Harvard Med Sch, Div Pulm Crit Care & Sleep Med, Beth Israel Deaconess Med Ctr, Boston, MA USA
[11] Natl Inst Publ Hlth, Cuernavaca, Morelos, Mexico
[12] Univ New Mexico, Sch Med, Pulm Crit Care & Sleep Med, Albuquerque, NM 87131 USA
[13] NYU, Dept Environm Med, Sch Med, 550 1St Ave, New York, NY 10016 USA
[14] NYU, Sch Med, Dept Populat Hlth, New York, NY USA
[15] Univ Toronto, Hosp Sick Children, Dalla Lana Sch Publ Hlth, Toronto, ON, Canada
[16] Univ Cape Town, Dept Paediat & Child Hlth, Cape Town, South Africa
[17] Univ Cape Town, MRC Unit Child & Adolescent Hlth, Cape Town, South Africa
[18] Univ Illinois, Dept Atmospher Sci, Sch Earth Soc & Environm, 105 S Gregory Ave, Urbana, IL 61801 USA