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Article History

Received: 17 January 2017

Accepted: 30 May 2017

First Online: 12 June 2017

Compliance with ethical standards

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: This reaserch did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

: HDRs were provided by the National Archive of SDO data, Ministry of Health, General Directorate of Healthcare Planning, VI Office. For this type of retrospective study, formal consent is not required.

: Giovanni Gabutti and Vincenzo Baldo received grants from Sanofi Pasteur MSD, GSK Biologicals SA, Novartis, Crucell/Janssen, Pfizer, Sequirus, Merck Italy, and Sanofi Pasteur for taking part to advisory boards, expert meetings, for acting as speaker and/or organizer of meetings/congresses and as principal investigator and chief of O.U. in RCTs. Rosa Prato has served in advisory committees related to herpes zoster vaccine for Sanofi Pasteur MSD; she also reports grants and nonfinancial support from Sanofi Pasteur MSD, Pfizer, GSK, and Novartis, outside this work. Domenico Martinelli reports grants and nonfinancial support from GSK, Pfizer, and Sanofi Pasteur MSD, outside this work. Nicoletta Valente, Silvia Cocchio, Armando Stefanati, and Tatjana Baldovin do not have any conflict of interest.

: HDRs were provided by the National Archive of SDO data, Ministry of Health, General Directorate of Healthcare Planning, VI Office. Accordingly to the current regulations, a specific permit by an Ethical Committee was not necessary, as no personal data were available and only anonymous unlinked aggregated data were analyzed. This study was performed in compliance to the Helsinki Declaration as well as to the Italian law (Decree n. 196/2003 for the protection of personal data).

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