1. Department of Urology Laboratory of Reconstructive Urology Institute of Urology West China HospitalSichuan University Chengdu China
2. Department of Statistics and Probability Michigan State University East Lansing MI USA
3. State Key Laboratory of Biotherapy and Cancer Center West China HospitalSichuan University Chengdu China
4. Key Laboratory of Bio‐Resources and Eco‐Environment of the Ministry of Education College of Life Sciences Sichuan University Chengdu China
5. Department of Biostatistics University of Michigan Ann Arbor MI USA