[1] Natl Jewish Hlth, Dept Med, Denver, CO USA
[2] Univ Colorado Anschutz Med Campus, Dept Med, 12700 E 19th Ave, Aurora, CO 80045 USA
[3] Univ Colorado Anschutz Med Campus, RNA Biosci Initiat, Aurora, CO USA
[4] Univ Colorado Anschutz Med Campus, Dept Immunol & Microbiol, Aurora, CO USA
[5] Colorado Sch Publ Hlth, Dept Environm & Occupat Hlth, Aurora, CO USA
[6] Colorado Sch Publ Hlth, Dept Epidemiol, Aurora, CO USA