inclusion criteria: * patients with confirmed diagnosis of covid-19 admitted to hospital; * duration of symptoms related to hospitalization ≤ 14 days; * patients ≥ 18 year old; * d-dimer above the upper limit of normal (collected until 72 hours before the randomization); * agreement to participate by providing the informed consent form (icf).

inclusion criteria: * patients with confirmed diagnosis of covid-19 admitted to hospital; * duration of symptoms related to hospitalization ≤ 14 days; * patients ≥ 18 year old; * d-dimer above the upper limit of normal (collected until 72 hours before the randomization); * agreement to participate by providing the informed consent form (icf).

inclusion criteria: - patients with confirmed diagnosis of covid-19 admitted to hospital; - duration of symptoms related to hospitalization ≤ 14 days; - patients ≥ 18 year old; - d-dimer above the upper limit of normal (collected until 72 hours before the randomization); - agreement to participate by providing the informed consent form (icf).

inclusion criteria: - patients with confirmed diagnosis of covid-19 admitted to hospital; - duration of symptoms related to hospitalization ≤ 14 days; - patients ≥ 18 year old; - d-dimer above the upper limit of normal (collected until 72 hours before the randomization); - agreement to participate by providing the informed consent form (icf).

inclusion criteria: - patients with confirmed diagnosis of covid-19 admitted to hospital; - onset of symptoms leading to hospitalization <14 days; - patients ≥ 18 year old; - d-dimer ≥ 3 x the upper limit of normal; - agreement to participate by providing the informed consent form (icf).

inclusion criteria: - patients with confirmed diagnosis of covid-19 admitted to hospital; - onset of symptoms leading to hospitalization <14 days; - patients ≥ 18 year old; - d-dimer ≥ 3 x the upper limit of normal; - agreement to participate by providing the informed consent form (icf).