Institute of Immunology;
Shandong University School of Medicine;
Jinan;
China;
Department of Clinical Laboratories;
Wujing Shandong Zongdui Hospital;
Jinan;
ChinaCorrespondence: Dr LF Gao;
Institute of Immunology;
Shandong University School of Medicine;
44# Wenhua Xi Road;
Jinan 250012;
China.;