1. General Dentistry, Boston University School of Dental Medicine, 100 East Newton Street, Rm. G-619, Boston, MA 02118, USA;
2. University of Helsinki Institute of Dentistry & Helsinki University Central Hospital, Finland;
3. Cerebro-vascular Disease and Stroke, SUNY Downstate Medical Center, Brooklyn, NY, USA;
4. Otorhinolaryngology/Oral and Maxillofacial Surgery, Kuopio University, Finland;
5. Cardiothoracic Surgery, Kuopio University Hospital, Finland;