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Analysis of Exposure and Respiratory Health Effects of Volcanic Eruption in the Canary Islands (ASHES). A SEPAR Study Alberto Ruano-Ravina, Orlando Acosta, David Díaz Pérez, Ciro Casanova, Valle Velasco, Ana Belén Llanos, Germán Peces-Barba, Esther Barreiro, Ana Cañas, Argelia Castaño, María Jesús Cruz Carmona, Carmen Diego, Judith Garcia-Aymerich, Cristina Martínez, María Molina-Molina, Xavier Muñoz, Francisco Javier Sánchez-Íñigo, Cristina Candal-Pedreira