1 Department of Andrology, Liaocheng People's Hospital affiliated to Shandong University, Jinan 250012, PR China; Clinical School of Taishan Medical University, Liaocheng, 252000, PR China.
2 Clinical School of Taishan Medical University, Liaocheng, 252000, PR China; Department of Cardiology, Liaocheng People's Hospital affiliated to Shandong University, Jinan 250012, PR China.
3 Clinical School of Taishan Medical University, Liaocheng, 252000, PR China; Department of Cardiology, Liaocheng People's Hospital affiliated to Shandong University, Jinan 250012, PR China. Electronic address: yaohc66@126.com.