Assessment of anti-factor Xa activity of enoxaparin for venous thromboembolism prophylaxis in morbidly obese surgical patients oleh Nouf Al Otaib, Zohour Bootah, Maha A Al Ammari, Tariq M Aldebasi, Abdulmalik M Alkatheri, Shmeylan A Al Harbi, Salah M AbuRuz, Abdulkareem M AlBekairy