Evolution of antibiotic prescription in Primary Health Care according to the indicators of the Spanish Action Plan on Antibiotic Resistance (PRAN) Carlos Marcilla Vázquez, Juan Ríos Laorden, Ángeles Lloret Callejo, Francisco Tejada Cifuentes, María José Tirado Peláez, Ignacio Párraga-Martínez

Natural history and optic neuritis in multiple sclerosis Bárbara Burgos-Blasco, Rebeca Madrigal-Sanchez, Carlos Llorente-la Orden, Celia Oreja-Guevara, Enrique Santos-Bueso

Natural progression of premature pubarche and underlying diseases María Luisa Sancho Rodríguez, Gloria Bueno Lozano, José Ignacio Labarta Aizpún, Antonio de Arriba Muñoz