Protocol for a phase IV double-blind randomised controlled trial to investigate the effect of the 13-valent pneumococcal conjugate vaccine and the 23-valent pneumococcal polysaccha... oleh Tao Chen, Duolao Wang, Konstantinos Liatsikos, Stephen B Gordon, Hassan Burhan, Ben Morton, Tinashe K Nyazika, Bradford D Gessner, Helen Hill, Andrea Collins, Josh Hamilton, Kelly Davies, Fred Fyles, Phoebe Hazenberg, Elizabeth Begier, Angela Hyder-Wright, Sherin Pojar, Christopher Myerscough, Jesus Reine, Ryan E Robinson, Britta Urban, Elena Mitsi, Carla Solorzano, Angela Quinn, Kaijie Pan, Annaliesa S Anderson, Christian Theilacker, Daniela M Ferreira, Kelly Convey, James Court, Madlen Farrar, Lisa Hitchins, Ashleigh Howard, Lauren Kerruish, Samuel Latham, Annabel Murphy, Elissavet Nikolaou, Angelina Peterson