Correction: Intranasal “painless” Human Nerve Growth Factors Slows Amyloid Neurodegeneration and Prevents Memory Deficits in App X PS1 Mice. - Simona Capsoni; Sara Marinelli; Marcello Ceci; Domenico Vignone; Gianluca Amato; Francesca Malerba; Francesca Paoletti; Giovanni Meli; Alessandro Viegi; Flaminia Pavone; Antonino Cattaneo (PLoS ONE, 2012)