1. Faculty of Medicine, University Clinics of Psychiatry and Medical Psychology, Universidade de Lisboa, Lisbon 1649-028, Portugal
2. Department of Mathematics and Center for Mathematics and Applications, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica, Lisbon 2829-516, Portugal
3. Department of Psychiatry, Centro Hospitalar Psiquiátrico de Lisboa, Lisbon 1749-002, Portugal
4. CHRC - Comprehensive Health Research Centre, NOVA Medical School, Universidade NOVA de Lisboa, Lisbon 1169-056, Portugal