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| Italy | |||||
| Studio Odontoiatrico | |||||
| Padova, Italy, 351 25 | |||||
| Spain | |||||
| Department of Periodontics, Faculty of Odontology, Universidad Complutense de Madrid | |||||
| Madrid, Spain, 28040 | |||||
| Switzerland | |||||
| Department of Periodontology, School of Dental Medicine, University of Berne | |||||
| Berne, Switzerland, CH-3010 | |||||
| Astra Tech AB |