Anti-factor Xa level monitoring of low-molecular-weight heparin for prevention of venous thromboembolism in critically ill patients (AXaLPE): protocol of a randomised, open-label c... oleh Chunmei Wang, Haibo Wang, Feng-Hua Wang, Li Jiang, Meiping Wang, Ya-chan Ning, Li-po Song, Pei-juan Li, Meng-xi Ding, Qian-Qian Pei, Shi-min Hu