1. Dept. of Orthodontics, Hebrew University-Hadassah Faculty of Dental Medicine, founded by the Alpha Omega Fraternity, Jerusalem, Israel
2. Dept. of Oral Biology, Hebrew University-Hadassah Faculty of Dental Medicine, PO Box 12277, Jerusalem 91220, Israeli
3. Connective Tissue Research Laboratory, Dept. of Oral Biology, Hebrew University-Hadassah Faculty of Dental Medicine, Jerusalem, Israel