1. Department of Experimental Biology, Faculty of Medicine; University of Porto; 4200-319 Porto Portugal
2. Departamento da Mulher e da Medicina Reprodutiva; Centro Hospitalar do Porto EPE; Largo Prof. Abel Salazar 4099-001 Porto Portugal
3. Obstetrics-Gynecology; Private Hospital Trofa; 4785-409 Trofa Portugal
4. Department of Mathematics, Faculty of Sciences; University of Porto; 4169-007 Porto Portugal
5. CMUP-Centre of Mathematics; University of Porto; 4169-007 Porto Portugal
6. Department of Medicine, Faculty of Medicine; University of Porto; 4200-319 Porto Portugal
7. Centro Hospitalar S. João; 4200-319 Porto Portugal
8. Obstetrics-Gynecology; Hospital-CUF Porto; 4100-180 Porto Portugal