1 Deputy Head, Department of Periodontology, School of Graduate Dentistry, Rambam Health Care Campus, Haifa, Israel. Electronic address: h_zigdon@rambam.health.gov.il.
2 Senior Member, Department of Periodontology, School of Graduate Dentistry, Rambam Health Care Campus, Haifa, Israel.
3 Head, Department of Periodontology, and Head, School of Graduate Dentistry, Rambam Health Care Campus, Haifa, Israel.