Department of Obstetrics and Gynecology General Hospital of Northern Theater Command(Heping Campus) Shenyang 110000 Liaoning Province China;
Department of Obstetrics and Gynecology General Hospital of Northern Theater Command(Heping Campus) Shenyang 110000 Liaoning Province China;
Department of Obstetrics and Gynecology General Hospital of Northern Theater Command(Heping Campus) Shenyang 110000 Liaoning Province China;
Pregnancy; Puerperium; Venous thromboembolism; Risk factors; Prevention; Anticoagulation;