Biofilm-Forming Bacteria Implicated in Complex Otitis Media in Children in the Post-Heptavalent Pneumococcal Conjugate Vaccine (PCV7) Era oleh Anastasios Ioannidis, Stylianos Chatzipanagiotou, Niki Vassilaki, Polyvios Giannakopoulos, Despina Hatzaki, Maria Magana, Athanasios Sachlas, George Mpekoulis, Alexandros Radiotis, Michail Tsakanikos, Georgina Tzanakaki, Evangelia Lebessi, Maria N. Tsolia