Changes in Meningococcal Strains in the Era of a Serogroup C Vaccination Campaign: Trends and Evolution in Belgium during the Period 1997-2012., Mattheus, Wesley, Hanquet Germaine, Collard J-M, Vanhoof Raymond, and Bertrand Sophie , PLoS One, 2015, Volume 10, Issue 10, p.e0139615, (2015)