1 Department of Health Information and Decision Sciences, Faculty of Medicine, University of Porto, Portugal; CINTESIS - Center for Research in Health Technologies and Information Systems, Portugal. Electronic address: jvasco.santos@gmail.com.
2 Department of Health Information and Decision Sciences, Faculty of Medicine, University of Porto, Portugal.
3 CINTESIS - Center for Research in Health Technologies and Information Systems, Portugal; Department of Obstetrics and Gynaecology, Faculty of Medicine, University of Porto, Portugal.
4 Department of Health Information and Decision Sciences, Faculty of Medicine, University of Porto, Portugal; CINTESIS - Center for Research in Health Technologies and Information Systems, Portugal.