PLGA nanoparticles as delivery systems for protoporphyrin IX in topical PDT: cutaneous penetration of photosensitizer observed by fluorescence microscopy - Silva, Carolina Loureiro da; Del Ciampo, José Orestes; Rossetti, Fábia Cristina; Bentley, Maria Vitória Lopes Badra; Pierre, Maria Bernadete Riemma (Journal of Nanoscience and Nanotechnology, 2013)