Impact of extreme physical exercise (28 consecutive marathons) on sleep time and structure Gualberto Buela-Casal; Noelia Ruiz-Herrera; Alejandro Guillén-Riquelme; Carlos Zamarrón; Francisco Gude-Sampedro;

Content Validity through Expert Judgment for the Depression Clinical Evaluation Test María Guillot-Valdés; Alejandro Guillén-Riquelme; Gualberto Buela-Casal;