Correction: Preparation, Cellular Internalization, and Biocompatibility of Highly Fluorescent PMMA Nanoparticles. Issue 3 (5th February 2013) - Vollrath, Antje; Pretzel, David; Pietsch, Christian; Perevyazko, Igor; Menzel, Roberto; Schubert, Stephanie; Pavlov, George M.; Weiß, Dieter; Beckert, Rainer; Schubert, Ulrich S.