1. Department of EpidemiologySchool of Public HealthZhengzhou UniversityZhengzhouHenanChina
2. Department of General SurgeryThe First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenanChina
3. Department of UrologyZhengzhou Third People's HospitalZhengzhouHenanChina
4. Department of International MedicineBeaumont Health SystemRoyal OakMichigan