title: Letter to the Editor: Authors' Response.
authors.affiliation: Department of Periodontology, School of Dental Medicine, Tufts University, Boston, Massachusetts.
authors.forename: Evangelos
authors.initials: E
authors.lastname: Papathanasiou
authors.affiliation: Division of Biostatistics and Experimental Design, School of Dental Medicine, Tufts University.
authors.forename: Matthew
authors.initials: M
authors.lastname: Finkelman
authors.affiliation: Department of Periodontology, School of Dental Medicine, Tufts University, and private practice in periodontics, Athens, Greece.
authors.forename: Andreas O
authors.initials: AO
authors.lastname: Parashis