Table 2. Study timelines and schedule.

Tasks	Screening period	Follow-up
		5–9 days after surgery	21–28 days after surgery
Informed consent	√
Demographic data	√
Surgical information	√
VTE related
Symptom assessment	√	√	√
Physical examination	√	√	√
Laboratory examination1	√	√	√
Imaging examination2	√	√	√
Caprini score	√	√
Prophylactic use of VTE	√	√	√
Evaluation for concomitant treatments	√	√	√
Evaluation for bleeding risk	√	√	√
Treatment compliance	√	√	√
Prevention of VTE related adverse events	√	√	√
Other adverse events	√	√	√

¹, DIC examination is an important examination item in laboratory examination, which should be examined 5–9 and 21–28 days after operation; ², imaging examination should be based on color Doppler ultrasound, if DVT or PE occurs, further venography or CTPA should be performed. DVT, deep vein thrombosis; PE, pulmonary embolism; VTE, venous thromboembolism; DIC, disseminated intravascular coagulation.