yan yang health examination center, qilu hospital of shandong university, jinan, china; health examination center, qilu hospital of shandong university, jinan, china. tel: +86-53182166920, fax: +86-53182166921 xiao-sheng fan department of cardiology people’s hospital of laiwu, laiwu, china cui-huan tian health examination center, qilu hospital of shandong university, jinan, china wei zhang health examination center, qilu hospital of shandong university, jinan, china jie li health examination center, qilu hospital of shandong university, jinan, china shu-qing li health examination center, qilu hospital of shandong university, jinan, china