1. Department of Stomatology, Tianjin First Central Hospital, Tianjin 300192, P.R. China
2. Department of Clinical Radiology, Kuopio University Hospital, FIN‑70210 Kuopio, Finland
3. Department of Clinical Laboratory Medicine, The Second Hospital of Tianjin Medical University, Tianjin Institute of Urology, Tianjin 300211, P.R. China