[1] Univ Maryland, Ctr Biomed Engn Physiol, Sch Med, Baltimore, MD USA
[2] Univ Maryland, Sch Med, Dept Physiol, Baltimore, MD USA
[3] Univ Maryland, Ctr Blood Oxygen Transport & Hemostasis, Sch Med, Dept Pediat, Baltimore, MD 21201 USA
[4] Univ Virginia, Dept Pathol, Sch Med, Charlottesville, VA USA
[5] Carter Immunol Ctr, Charlottesville, VA USA
[6] Univ Maryland, Sch Med, Dept Pathol, Baltimore, MD 21201 USA