[1] Peoples Hosp Rizhao, Dept Cardiol, Rizhao 276800, Shandong, Peoples R China
[2] Peoples Hosp Rizhao, Dept Resp Med, Rizhao 276800, Shandong, Peoples R China
[3] Peoples Hosp Zhangqiu, Dept Cardiol, Jinan 250200, Shandong, Peoples R China
[4] Peoples Hosp Zhangqiu, Dept Crit Care Med, Jinan 250200, Shandong, Peoples R China
[5] Peoples Hosp Zhangqiu, Dept Clin Lab, Jinan 250200, Shandong, Peoples R China
[6] Peoples Hosp Weifang, Dept Clin Lab, 151 Guangwen St, Weifang 261000, Shandong, Peoples R China