Postgraduate Course of Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. Electronic address: xarmar@msn.com. Center for Adolescent Medicine and UNESCO Chair on Adolescent Health Care, First Department of Pediatrics, School of Medicine, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens, Greece; Unit of Clinical and Translational Research in Endocrinology, First Department of Pediatrics, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. Oncology Unit, 3rd Department of Medicine, School of Medicine, National and Kapodistrian University of Athens, Sotiria General Hospital, Athens, Greece. Breast Cancer Department, General Anti-Cancer Hospital Agios Savvas, Athens, Greece. Postgraduate Course of Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece; Center for Adolescent Medicine and UNESCO Chair on Adolescent Health Care, First Department of Pediatrics, School of Medicine, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens, Greece; Unit of Clinical and Translational Research in Endocrinology, First Department of Pediatrics, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. Postgraduate Course of Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.