This author has not been identified. Look up 'Álvaro Valencia-Parra' in GoogleThis author has not been identified. Look up 'Luisa Parody' in GoogleThis author has not been identified. Look up 'Ángel Jesús Varela-Vaca' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Ismael Caballero' in GoogleThis author has not been identified. Look up 'María Teresa Gómez López' in Google