1. Department of Urology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Huangpu, Shanghai 200092, China
2. Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, MN 55905, US
3. Department of Gastroenterology, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong 510080, China
4. Division of Biomedical Statistics and Informatics, Mayo Clinic College of Medicine, Rochester, MN 55905, US