Porphyromonas endodontalis in chronic periodontitis: a clinical and microbiological cross-sectional study - Bedran, Telma Lombardo; Marcantonio, Rosemary Adriana Chiérici; Spin Neto, Rubens; Mayer, Marcia Pinto Alves; Grenier, Daniel; Spolidorio, Luis Carlos; Spolidorio, Denise Palomari (Journal of Oral Microbiology, 2012)