Influence of seasonality and biological activity on infection by helminths in Cantabrian bear oleh Esther Valderrábano Cano, Vincenzo Penteriani, Iris Vega, María del Mar Delgado, Enrique González-Bernardo, Giulia Bombieri, Alejandra Zarzo-Arias, Rita Sánchez-Andrade Fernández, Adolfo Paz-Silva