1. Department of Obstetrics and Gynecology; IRCCS Foundation Policlinico San Matteo and University of Pavia; Pavia Italy
2. Immunogenetics Laboratory; Immunohematology and Transfusion Center; IRCCS Foundation Policlinico San Matteo; Pavia Italy
3. First Department of Medicine; IRCCS Foundation Policlinico San Matteo; Pavia Italy
4. Clinical Chemistry Laboratory; IRCCS Foundation Policlinico San Matteo; Pavia Italy
5. Clinical Epidemiology and Biometric Unit; IRCCS Foundation Policlinico San Matteo; Pavia Italy