Use of anorganic bovine-derived hydroxyapatite matrix/cell-binding peptide (P-15) in the treatment of class II furcation defects: a clinical and radiographic study in humans - Eto, Ana L; Joly, Julio C; Jeffcoat, Marjorie; Araújo, Ney Soares de; Araujo, Vera Cavalcanti de; Cury, Patricia R (Journal of Periodontology, 2007)