[1] GSK Vaccines,Center for Pharmacoepidemiology, Unit of Clinical Epidemiology, Department of Medicine
[2] Karolinska Institutet,Department of Women’s and Children’s Health
[3] IMS Health,Department of Clinical Sciences, Pediatrics
[4] University of Padova,Centre for Integrated Health Care Research
[5] Umeå University,Department of Pediatrics
[6] Instituto Hispalense de Pediatría,Kinderklinik und Poliklinik
[7] Harbinson House Surgery,undefined
[8] University of Durham,undefined
[9] Hospital Universitario La Paz,undefined
[10] Carmel Medical Practice,undefined
[11] Dr. Castroviejo Centro de Salud,undefined
[12] Centro de Salud Pozuelo-Estación,undefined
[13] GlaxoSmithKline GmbH & Co.,undefined
[14] Universitätsklinikum Würzburg,undefined