1. University of Beira Interior (UBI), Covilhã, Portugal & NECE – Research Unit in Business Sciences, Covilhã, Portugal
2. Polytechnic Institute of Castelo Branco (IPCB), Covilhã, Portugal & NECE – Research Unit in Business Sciences, Covilhã, Portugal
3. University of Beira Interior (UBI) Covilhã, Portugal & NECE – Research Unit in Business Sciences, Covilhã, Portugal