From the Department of Pathology and Immunology, Washington University School of Medicine, St Louis, Missouri.
Accepted for publication June 20, 2017.
The authors declare no conflicts of interest.
Reprints will not be available from the authors.
Address correspondence to Ronald Jackups Jr, MD, PhD, 660 S Euclid Ave 8118, St Louis, MO 63110. Address e-mail to firstname.lastname@example.org.