[1] Univ Alberta, Fac Med & Dent, Dept Periodontol, Edmonton, AB, Canada
[2] Hebrew Univ Jerusalem, Hadassah Sch Dent Med, Dept Community Dent, Jerusalem, Israel
[3] Israel Def Forces, Med Corps, Oral & Maxillofacial Ctr, Dept Prosthodont, Tel Hashomer, Israel
[4] Israel Def Forces, Med Corps, Oral & Maxillofacial Ctr, Dept Periodontol, Tel Hashomer, Israel
[5] Hebrew Univ Jerusalem, Hadassah Sch Dent Med, Dept Oral Med Sedat & Maxillofacial Imaging, Jerusalem, Israel