Keefektifan dan Keamanan Heparin Inhalasi pada pasien ICU COVID-19 dengan dosis total harian berbeda: Kajian pada Alveolar-Arterial Oxygen Difference, Activated Partial Tromboplastin Time dan d-Dimer = Effectivity and Safety Inhaled Heparin for COVID-19 ICU Patients with variety of daily total dose based on Alveolar-Arterial Oxygen Difference, Activated Partial Thromboplastin Time and d-Dimer