Application of PDCA cycle to reduce the incidence of hemolysis in venous blood specimen (运用PDCA循环降低静脉血标本溶血率) oleh SHU Baozhen (舒宝珍), YU Lei (于蕾), LYU Jing (吕晶), CHEN Baili (陈百丽), XING Yumei (邢玉梅), ZHOU Jie (周洁), XU Jingjin (徐京巾)