iPixel: A visual content-based and semantic search engine for retrieving digitized mammograms by using collective intelligence. - Alor-Hernández, Giner; Pérez-Gallardo, Yuliana; Posada-Gómez, Rubén; Cortes-Robles, Guillermo; Rodríguez-González, Alejandro; Aguilar-Laserre, Alberto A. (Informatics for Health & Social Care, 2012)