- Correspondence to Dr Helena Machado, Centre for Social Studies, University of Coimbra, Colégio de S Jerónimo, Largo D Dinis, Apartado 3087, Coimbra 3000-995, Portugal;
- Received March 20, 2014
- Revised February 13, 2015
- Accepted June 16, 2015
- First published July 2, 2015.
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