1. Therapy Center for Dependent Individuals (KETHEA), Athens, Greece
2. Pain Relief and Palliative Care Unit, Department of Radiology, Areteion Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
3. KETHEA Research Department Director, Department of Research, Therapy Center for Dependent Individuals (KETHEA), Athens, Greece
4. Health Psychologist, Pain Relief and Palliative Care Unit, Department of Radiology, Areteion Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
5. Biostatistician, Pain Relief and Palliative Care Unit, Department of Radiology, Areteion Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece