[1] Univ Washington, Dept Surg, 1959 NE Pacific St,Box 356410, Seattle, WA 98195 USA
[2] Med Univ S Carolina, Dept Surg, Charleston, SC 29425 USA
[3] Univ Washington, Dept Pathol, Seattle, WA 98195 USA
[4] Univ Washington, Dept Anesthesiol, Seattle, WA 98195 USA
[5] Univ Washington, Dept Med, Seattle, WA 98195 USA