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Waleria Hryniewicz is an Editorial Board member of\n                      Infectious Diseases and Therapy\n                      . Waleria Hryniewicz was not involved in the selection of peer reviewers for the manuscript nor any of the subsequent editorial decisions. The remaining authors declare no conflict of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of Interest"}},{"value":"The study was conducted as continuous surveillance in accordance with the World Health Medical Association 1966 Declaration of Helsinki and the EU rules of Good Clinical Practice. The National Reference Centre for Bacterial Meningitis (NRCBM) was established by the Ministry of Health in 1997 to monitor invasive infections in Poland, including invasive disease caused by\n                      Haemophilus influenzae\n                      . Currently, the NRCBM operates under the Act of December 5, 2008, on the Prevention and Control of Infections and Infectious Diseases in Humans (Journal of Laws of 2008, No. 234, item\u00a01570), and therefore, approval from the institutional review board is not required.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical Approval"}}]}}