The Incidence of Pulmonary, Cardiovascular and Renal System Non-communicable Complications Associated With the Post-acute Phase of the Infection by Covid-19

Inclusion Criteria: Group A (comparators) 1. Adults (18 years or more) of both genders 2. Negative history of acute COVID-19 Group B (patients with ΝΟ dysfunction) 1. Adults (18 years or more) of both genders 2. History of acute COVID-19 hospitalized or non-hospitalized. All cases appearing from start of the pandemic until the last six months may apply 3. Absence of any current overt organ dysfunction 4. Absence of signs of any organ dysfunction during acute COVID-19 Group C (patients with dysfunctions) 1. Adults (18 years or more) of both genders 2. History of acute COVID-19 hospitalized or non-hospitalized. All cases appearing from start of the pandemic until the last six months may apply 3. Presence of signs of organ dysfunction of the lung, the kidneys or the heart during acute COVID-19 Exclusion Criteria: Group A (comparators) 1. Any other co-existing disorder generating clinical symptoms 2. Failure to thrive according to the attending physicians 3. Pregnancy or lactation Group B (patients with ΝΟ dysfunction) 1. Any other co-existing disorder generating clinical symptoms 2. Failure to thrive according to the attending physicians 3. Pregnancy or lactation Group C (patients with dysfunctions) 1. Any other co-existing disorder generating clinical symptoms 2. Medical history of any of: * stage III or IV chronic obstructive pulmonary disease according to the GOLD criteria * pulmonary fibrosis or pulmonary hypertension * stage IV solid tumour malignancy under chemotherapy or radiotherapy * systemic sclerosis * congestive heart failure * stage II, III or IV dyspnoea according to the New York Heart Association classification before the acute COVID-19 3. Limited chance of survival for at least six months due to co-existing comorbidity(-ies) according to the judgement of the attending physicians 4. Pregnancy or lactation