1. Department of Obstetrics and Gynecology, Hospital General San Jorge, Huesca, Spain;
2. Escuela Politécnica de La Almunia, Universidad de Zaragoza, Zaragoza, Spain;
3. Department of Obstetrics and Gynecology, Hospital Clínico Universitario Lozano Blesa-IIS Aragón, Zaragoza, Spain;
4. Department of Haemathology, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain;
5. Unit of Gastroenterology and Hepathology, Hospital General San Jorge, Huesca, Spain;
6. Department of Statistical methods, Universidad de Zaragoza, Zaragoza, Spain;
7. Department of Urology, Hospital Universitario Miguel Servet-IIS Aragón, Zaragoza, Spain