1. Department of Periodontology; Eastman Institute for Oral Health, University of Rochester; Rochester New York 11794-8700
2. Department of Periodontology; Stony Brook University, School of Dental Medicine; Stony Brook New York 11794-8700
3. Department of Laser Technology and Biomedical Optics; St. Petersburg National Research University of Information Technologies, Mechanics and Optics; Saint Petersburg Russia
4. Dental Photonics, Inc.; 1600 Boston-Providence Highway; Walpole Massachusetts 02081