[1] Univ Washington, Dept Med, Div Allergy & Infect Dis, Seattle, WA USA
[2] Univ Washington, Dept Pathol, Seattle, WA 98195 USA
[3] Univ Washington, Dept Lab Med, Seattle, WA 98195 USA
[4] Univ Washington, Dept Med, Div Pulm Crit Care & Sleep Med, Seattle, WA USA
[5] Univ Washington, Dept Med, Div Gastroenterol, Seattle, WA USA