1. Department of Hematology, Nephrology, and Rheumatology, Akita University Graduate School of Medicine, Japan
2. Department of Obstetrics and Gynecology, Graduate School of Medicine, Akita University, Japan
3. Department of Hematology and Oncology, Odate Municipal General Hospital, Japan
4. Department of Obstetrics and Gynecology, Odate Municipal General Hospital, Japan