2Cortellini Pierpaolo,Tonetti Maurizio,Baldi Carlo,Francetti Luca,Rasperini Giulio,Rotundo Roberto,Nieri Michele,Franceschi Debora,Labriola Antonella,Prato Giovanpaolo Pini.Does placement of a connective tissue graft improve the outcomes of coronally advanced flap for coverage of single gingival recessions in upper anterior teeth? A multi-centre, randomized, double-blind, clinical trial. Journal of clinical periodontology . 2008