Inclusion Criteria:  Positive reserve transcriptase polymerase chain reaction (RT-PCR) test of nasopharyngeal swab for COVID- 19, and pneumonia confirmed by a Computed Tomography (CT). Negative reserve transcriptase polymerase chain reaction (RT-PCR) test of nasopharyngeal swab for COVID- 19, but radiological and biochemical examinations unambiguously suggest COVID-19, when other possible diagnoses were excluded.  Exclusion Criteria:  Pregnancy History of heparin and associated drug allergies.