[1] Yale Univ, Sch Med, Dept Pediat, Div Infect Dis, New Haven, CT 06520 USA
[2] Yale Univ, Sch Med, Dept Pediat, Div Resp Med, New Haven, CT 06520 USA
[3] Yale Univ, Sch Med, Dept Pediat, Div Gen Pediat, New Haven, CT 06520 USA
[4] Yale Univ, Sch Med, Dept Epidemiol & Publ Hlth, New Haven, CT USA
[5] Yale Univ, Sch Med, Dept Lab Med, New Haven, CT USA