From the Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI.

Reprints: Yongjun Liu, MD, PhD, Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, L5/133 CSC, Madison, WI 53792. E-mail: [email protected].

The authors have no funding or conflicts to declare.