1. Department of Urology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
2. Institute of Anatomy and Cell Biology, Unit of Reproductive Biology, Justus-Liebig-University of Giessen, Giessen, Germany
3. Medical Research Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
4. Institute for Genetics, Justus-Liebig-University of Giessen, Giessen, Germany
5. Institute of Medical Microbiology, Justus-Liebig-University of Giessen, Giessen, Germany
6. Klinikum St Marien Amberg, Amberg and Kliniken Nordoberpfalz AG, Weiden, Germany