[1] Johns Hopkins Bloomberg Sch Publ Hlth, Baltimore, MD USA
[2] Johns Hopkins Univ, Dept Med, Div Clin Immunol & Allergy, Baltimore, MD USA
[3] Hosp Univ Prof Edgard Santos, Serv Imunol, Salvador, BA, Brazil
[4] Univ Fed Bahia, Brazil Ctr Resp Dis, Salvador, BA, Brazil