1. University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (K.M.K., A.F.D.)
2. Clinical Laboratories, University of Pittsburgh Medical Center Presbyterian Hospital, Pittsburgh, Pennsylvania (J.A.R.)
3. Clinical Laboratories, University of Pittsburgh Medical Center Presbyterian Hospital, and University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (A.W.P.)
4. Clinical Laboratories, University of Pittsburgh Medical Center Presbyterian Hospital, University of Pittsburgh School of Medicine, McGowan Institute for Regenerative Medicine, University of Pittsburgh, and Clinical Laboratory, Children's Hospital of Pittsburgh of UPMC, Pittsburgh, Pennsylvania (K.T.)