1. Department and Clinic of Internal Medicine, Occupational Diseases, Hypertension and Clinical Oncology, Wroclaw Medical University, 50-556 Wroclaw, Poland
2. Medonet, Ringier Axel Springer Poland, Domaniewska St. 49, 02-672 Warsaw, Poland
3. Department of Clinical and Experimental Pathology, Wroclaw Medical University, 50-367 Wroclaw, Poland
4. Faculty of Medicine, Wroclaw Medical University, J. Mikulicza-Radeckiego 5, 50-345 Wroclaw, Poland
5. Statistical Analysis Center, Wroclaw Medical University, 50-368 Wroclaw, Poland
6. Clinical Department of Geriatrics, Wroclaw Medical University, Pasteur 4 Street, 50-367 Wroclaw, Poland