References

National Institute of Cardiovascular Diseases Bratislava
Mid-Slovak Institute of Cardiovascular Diseases Banská Bystrica
Eastern-Slovak Institute of Cardiovascular Diseases Košice
University Hospital Bratislava
University Hospital of L. Pasteur Košice
University Hospital Martin
Faculty Hospital and Health Clinic of F.D. Roosevelt Banská Bystrica
Faculty Hospital Nitra
Faculty Hospital and Health Clinic Nové Zámky
Faculty Hospital and Health Clinic of J. A. Reiman Prešov
Faculty Hospital Trnava
Faculty Hospital and Health Clinic Žilina
Central Military Hospital SNP Ružomberok  – Faculty Hospital