Inclusion Criteria:  Previously positive for COVID-19 and now negative and undergoing treatment Pulmonary rehabilitation; Compatibility to participate in the study as judged by the physician; Able to provide Informed Consent.  Exclusion Criteria:  The physician's unfavorable opinion of inclusion in the study because he or she is unable to provide Informed Consent; Patients with lung cancer; Documented psychiatric disorders; Immunodepression; Patients with terminal or neurodegenerative diseases (e.g., other forms of cancer, Amyotrophic Lateral Sclerosis (ALS)).