1 Department of Hematology/Oncology, San Antonio Military Medical Center, San Antonio, TX.
2 Department of Pathology and Laboratory Medicine, San Antonio Military Medical Center, San Antonio, TX. Electronic address: Brendan.c.graham.mil@mail.mil.
3 Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, MN.
4 Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN.