This study is part of the research project, implemented within the framework of the “Reinforcement Programme of Human Research Manpower” (PENED) and co-financed by National and Community Funds (25% from the Greek Ministry of Development-General Secretariat of Research and Technology and 75% from E.U.-European Social Fund).
The researchers wish to thank the company K&N Efthymiadis for the co-financing of a part of the study and the impeccable collaboration during the whole of the study.