1. FACULTY OF NURSING, UNIVERSITY OF THESSALLY, THESSALLY, GREECE
2. FACULTY OF MEDICINE, UNIVERSITY OF THESSALY, THESSALY, GREECE
3. FACULTY OF MEDICINE, UNIVERSITY OF THESSALY, THESSALY, GREECE; CENTER FOR CLINICAL EVIDENCE SYNTHESIS, THE INSTITUTE FOR CLINICAL RESEARCH AND HEALTH POLICY STUDIES, TUFTS MEDICAL CENTER, TUFTS UNIVERSITY SCHOOL OF MEDICINE, BOSTON, MA, UNITED STATES