1. Azienda Sanitaria Locale ASL AL; Servizio Regionale di Riferimento per l'Epidemiologia, SSEpi-SeREMI - Cochrane Vaccines Field; Via Venezia 6 Alessandria Piemonte Italy 15121
2. The Cochrane Collaboration; Via Puglie 23 Roma Italy 00187
3. College of Medicine, King Saud University; Department of Family and Community Medicine; Holder, Bahamdan Research Chair for Evidence-Based Health Care and Knowledge Translation Riyadh Saudi Arabia 11461
4. Lazio Regional Health Service; Department of Epidemiology; Via di Santa Costanza, 53 Rome Italy 00198
5. Local Health Unit Alessandria- ASL AL; Regional Epidemiology Unit SeREMI- Cochrane Vaccines Field; Via Venezia 6 Alessandria Alessandria Italy 15121