[1] Univ Calif San Francisco, Dept Pathol, San Francisco, CA 94143 USA
[2] Univ Kansas, Med Ctr, Dept Pathol & Oncol, Kansas City, KS 66103 USA
[3] Childrens Hosp Philadelphia, Dept Pathol, Philadelphia, PA 19104 USA
[4] Univ Virginia, Sch Med, Dept Pathol, Charlottesville, VA 22908 USA
[5] Univ Zurich Hosp, Dept Pathol, CH-8091 Zurich, Switzerland