1. Nursing Department, University of Évora, 7000-801 Évora, Portugal
2. Garcia de Orta Hospital, EPE, 2805-267 Almada, Portugal
3. Escola de Doctorat, Universitat Rovira i Virgili, 43005 Tarragona, Spain
4. Comprehensive Health Research Centre, University of Évora, 7000-801 Évora, Portugal
5. Department of Mathematics, School of Sciences and Technology, University of Évora, 7000-671 Évora, Portugal
6. Center for Research in Mathematics and Applications (CIMA), IIFA, 7000-671 Évora, Portugal
7. Institute for Advanced Studies and Research, University of Évora, 7004-516 Évora, Portugal