Repositorio Institucional de la Universidad de Oviedo

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20141897

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This research has been possible, thanks to the support of the Spanish Ministry of Education via FPU grant AP2007-3209, partially funded by the European Social Fund. The authors are especially thankful to Professor Marwan Hassan for his large and valuable support and suggestions along the development of this work. We also wish to thank Miguel Fernández and Jose Crespo for their invaluable help during fieldwork. We are also thankful to Richard A.Marston and the two anonymous reviewers for their comments and suggestions that strongly improved the current paper.