1. Department of Periodontology and Oral Diseases, Medical University of Warsaw, Poland
2. Department of Internal Medicine & Cardiology, with the Centre for Management of Venous Thromboembolic Disease, Medical University of Warsawa, Poland
3. Department of Periodontology, Pomeranian Medical University, Poland
4. Department of Periodontology, Medical Unversity of Lublin, Poland
5. Department of Periodontal and Oral Mucosa Diseases, Medical University of Białystok Poland
6. Department of Periodontology, Wroclaw Medical University, Poland