Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Clinical Laboratories, University of Pittsburgh Medical Center, Presbyterian Hospital, Pittsburgh, Pennsylvania. Division of Medical Toxicology, Department of Emergency Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania. Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania; Clinical Laboratories, University of Pittsburgh Medical Center, Presbyterian Hospital, Pittsburgh, Pennsylvania; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; Clinical Laboratory, Children's Hospital of Pittsburgh of UPMC, Pittsburgh, Pennsylvania.