Histological results after maxillary sinus augmentation with Straumann® BoneCeramic, Bio-Oss®, Puros®, and autologous bone. A randomized controlled clinical trial - Schmitt, C M; Doering, H; Schmidt, T; Lutz, R; Neukam, F W; Schlegel, K A (Clin Oral Implants Res, 2013)