1. Department of Oncology, Jinan Central Hospital, Affiliated to Shandong University, Jinan, P. R. China
2. Department of Internal Medicine, Saint Louis University School of Medicine, Saint Louis, MO, USA
3. Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, P.R. China
4. Department of Genetics, Washington University School of Medicine, Saint Louis, MO, USA