1. First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, Aghia Sophia Children’s Hospital, 11527 Athens, Greece
2. Postgraduate Course on “The Science of Stress and Health Promotion”, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
3. School of Electrical and Computer Engineering, National Technical University of Athens, 15780 Athens, Greece
4. Department of Advanced Computing Sciences, Faculty of Sciences and Engineering, Maastricht University, 6200 MD Maastricht, The Netherlands