- Correspondence to Professor Ángel López-Nicolás, Departamento de Economía, Facultad de Ciencias de la Empresa, Universidad Politécnica de Cartagena, Cartagena 30201, Spain;
- Received March 2, 2018
- Revised July 10, 2018
- Accepted July 13, 2018
- First published August 17, 2018.
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