1. Department of Postgraduate Clinical Training Center, Toyohashi Municipal Hospital, Toyohashi, Japan.
2. Department of Obstetrics and Gynecology, Toyohashi Municipal Hospital, Toyohashi, Japan.
3. Department of Hematology and Oncology, Toyohashi Municipal Hospital, Toyohashi, Japan.
4. Department of Hematology, Nagoya Graduate School of Medicine, Nagoya, Japan.
5. Department of Internal Medicine, Toyohashi Hematology Oncology Clinic, Toyohashi, Japan.