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. 2018 Apr 19;16:68. doi: 10.1186/s12955-018-0887-x

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Schematic definition and duration of the observational period. Schematic representation of the observational period. All the patients were enrolled at T_− 1, completed the questionnaires about the previous 12 months, and underwent a simulation test period (STP), named preSCS period. At T₀, those who responded positively to the STP were implanted with implantable pulse generator (postSCS period) and completed again the questionnaires at that time and at T_6, T_12, T₁₈ and T₂₄